Keyword Research: How to Find the Best SEO Keywords for Your Website

Every search result page exists because someone typed a question, a product name or a half-formed idea into a search box. Keyword research is how you work backwards from that behaviour: you collect the language your audience uses, interpret why they searched it, and decide which pages deserve to answer it.

This guide covers the fundamentals and the judgement calls — definitions, the main metrics, how to choose targets, and the mistakes that waste months of content effort — plus the MailCannon Keyword Research Tool, a free keyword research tool you can use without an account.

Key Takeaways

• Keyword research identifies the searches your audience actually uses, so content starts from evidence rather than guesses.
• Search volume alone should never decide which keyword you target.
• Search intent — what the searcher wants to accomplish — matters more than exact wording.
• Long-tail keywords often reveal specific, winnable content opportunities even at low volume.
• CPC can hint at advertiser interest, but it is an advertising metric, not an SEO ranking factor.
• Volume, CPC and difficulty figures from any tool are estimates; treat them as directional and verify against real results pages.
• MailCannon's Keyword Research Tool helps you discover, group and export keyword ideas — without inventing metrics it does not have.

What Is Keyword Research?

Keyword research is the practice of finding the terms people type into search engines, understanding why they type them, and mapping those terms to pages you can create or improve. It sits between your audience and your content plan.

Four ideas run through everything that follows:

• Keywords are the words and phrases people search for, from a single word like smtp to a full question like how does email marketing work.
• Search queries are the exact strings a person types. A keyword is the normalized version you target; a query is what actually appears in the search box.
• Search demand is how many people search for a term, in a language and market, over time. It is always an estimate.
• User intent is what the searcher is trying to accomplish — learn, compare, reach a site, or act.
• Content opportunities are the gaps where intent exists but current results are weak, thin or outdated.

Done well, keyword research tells you which topics deserve a page, what that page must cover, and which questions should become sections, subpages or follow-up articles.

Why Is Keyword Research Important for SEO?

Search engines match pages to intent, not to ambition. Keyword research is how you build that match deliberately:

• It reveals your audience. People rarely describe their problem the way a company describes it internally.
• It plans your content. Real questions become an editorial calendar instead of a list of guesses.
• It aligns pages with intent. A product page will not satisfy a definition query, and a blog post will not satisfy a purchase query.
• It uncovers topics you would miss. Integrations, edge cases and comparison queries rarely surface in internal brainstorming.
• It surfaces long-tail demand. Specific queries often face less competition.
• It organizes your site. Clusters show where one strong page beats several weak ones.

Keyword research does not guarantee rankings. It improves the odds by making sure you publish the right page for the right query — competition, authority, quality and technical health still decide the result.

How Does Keyword Research Work?

Most keyword research follows the same loop:

1. Choose a seed topic you know well.
2. Generate related keywords from it.
3. Examine the intent behind each candidate.
4. Review whatever metrics are available — volume, CPC, difficulty — as estimates.
5. Identify long-tail variations and questions.
6. Group keywords that share the same intent.
7. Select the targets that match your goals and capabilities.
8. Create genuinely useful content for each target.
9. Monitor performance and refine over time.

The loop repeats. New questions appear, old pages decay, and intent shifts as products and markets change.

What Is a Seed Keyword?

A seed keyword is the starting topic: a product, category, problem or concept close to your business. Seeds are usually short and broad, which makes them poor final targets but excellent starting points.

Example — seed: email marketing

• email marketing software
• email marketing for small business
• email marketing automation
• best email marketing tools
• how does email marketing work

Each expands into its own cluster. Good seeds come from what you sell, what customers ask support, and what your audience already searches for.

How to Find Keywords for Your Website

A practical sequence you can repeat for any site:

1. List your real topics. Products, services, features, problems you solve, and the questions customers ask.
2. Expand each into variations — synonyms, qualifiers, audiences, use cases and comparisons.
3. Run those seeds through a keyword research tool to collect related titles, questions and longer phrases.
4. Add the questions your audience actually asks from support tickets, sales calls, communities and forums.
5. Check the intent of every candidate by looking at what currently ranks for it.
6. Group variations that share an intent into one target page.
7. Prioritize by relevance to your business, clarity of intent, and whether you can outdo what already exists.
8. Publish, then re-check. Today's side topic can become tomorrow's main category.

Your existing data belongs here too: pages you already rank for, questions you already answer, and queries that bring impressions without clicks. Those are usually the cheapest wins available.

What Is Keyword Search Volume?

Search volume is an estimate of how often a term is searched in a given period and market — usually expressed as a monthly average. It answers “how much interest is there?”, and it is one of the most misunderstood numbers in SEO.

• Providers differ. Each tool uses its own data, sampling and modelling, so two reputable tools can disagree widely on the same keyword.
• Geography and language matter. Volume is per market and per language; translating a keyword does not transfer its volume.
• Seasonality matters. Averaging twelve months hides holidays, tax seasons and product launches.
• Averaging hides volatility. A steady 900 and a spiky 900 behave very differently.
• Zero does not mean nobody cares. New and niche terms are frequently undercounted.

Use volume to compare options within one dataset, not as an absolute truth, and never pick a keyword only because the number is big. As shown later in this guide, MailCannon's keyword tool displays no volume figures at all because no metrics provider is connected.

What Does CPC Mean in Keyword Research?

CPC stands for cost per click: the average amount an advertiser pays when someone clicks their ad for a given keyword. It belongs to paid search, where budgets, bids and auctions set the price.

Why it still appears in keyword research:

• It can signal that advertisers see commercial value in a topic.
• It helps compare the relative cost of commercial terms within one market and period.
• It changes constantly with competition, season, location and device.

High CPC does not mean a keyword is good for SEO, and CPC is not a Google organic ranking factor. A keyword can have a high CPC and almost no organic volume, or strong organic demand and no advertisers at all. Treat it as advertising context, nothing more.

What Is Keyword Difficulty?

Keyword difficulty (sometimes called competition) is normally a third-party estimate of how hard it would be to rank for a term. Each provider computes it differently — often from backlink profiles, domain authority or the strength of the current top results — so scores are not comparable between tools.

• Treat any difficulty score as a rough filter, not a verdict.
• Look at the actual results page: who ranks, how strong those pages are, and how well they answer the query.
• Check whether the intent even matches what you offer.
• Prefer language like potential opportunity or lower estimated competition over promises about ranking.

MailCannon's tool does not compute keyword difficulty. It offers an opportunity score — an openly documented MailCannon heuristic that rewards specific wording, questions and commercial modifiers. It is not Google Keyword Difficulty, not a ranking probability and not evidence that a term is easy to rank for.

What Is Search Intent?

Search intent is the job the searcher is trying to get done. Most queries fall into four families, and the intent decides what kind of page should rank:

Intent is not always clean. Email marketing tools could be informational (what exists?) or transactional (buy now), and the only reliable way to tell is to look at what currently ranks. Automated classification is a helpful shortcut, but it can be wrong — MailCannon infers intent from wording and labels it as a heuristic for exactly this reason.

What Are Long-Tail Keywords?

Long-tail keywords are longer, more specific phrases that describe a narrower need. They sit at the far end of the search-demand curve, where individual terms are searched less often but mean a great deal more.

• Broad: email marketing
• Long-tail: how to improve email marketing deliverability

Specific searches are useful because they name the audience, problem or use case directly, leave far less ambiguity about intent, and point at concrete page formats — guides, checklists, comparisons, troubleshooting pages.

Low volume does not mean low value: a phrase searched 40 times a month by exactly the people you sell to can outperform a head term searched 40,000 times. But long-tail keywords are not automatically easy to rank for either — strong existing answers can occupy even very specific queries.

How to Find Question Keywords

Question keywords are queries phrased as questions: what is…, how to…, how does… work, why does…, when should…, can I…, which…, where…. They are the raw material for guides and tutorials, FAQ and glossary pages, and comparison pages such as “X vs Y”.

They also matter for answer engines and AI search experiences, which favour content that states a clear answer up front and supports it with evidence. In the MailCannon tool, the Questions & GEO view collects question-shaped ideas from your topic — prompts for research that you should confirm against your audience before writing.

How to Group Related Keywords

The most common structural mistake in SEO is publishing one page per keyword variation. If several phrases share the same intent, they belong on the same page. Take this cluster — email deliverability, improve email deliverability, email deliverability tips, how to improve email deliverability. All four searches want the same outcome: what affects deliverability, plus concrete fixes. One thorough article beats four thin ones competing with each other.

• Group by intent, not by shared words.
• Build topic clusters: one cornerstone page plus supporting pages that link to it.
• Check what you already publish before creating anything new.
• Avoid keyword cannibalization — two pages targeting the same intent split attention and confuse both readers and crawlers.

How to Use Keyword Research for Blog Content

For blogging, the workflow is short and repeatable:

keyword → intent → topic → article → supporting questions → internal links

Worked example:

1. Seed: email deliverability.
2. Intent: informational with a problem-solving bent.
3. Topic: a guide titled “How to Improve Email Deliverability”.
4. Supporting sections pulled from related searches: SPF, DKIM, DMARC, spam complaints, sender reputation, list hygiene, email content.
5. Supporting articles for the sections that deserve their own page, each linking back to the cornerstone guide.
6. Internal links from older relevant posts into the new guide, with descriptive anchors.

The same pattern works for any niche. MailCannon's own library follows it: a definition piece such as what email marketing is sits beside practical pieces like 10 email marketing strategies and troubleshooting content like how to improve email deliverability.

Keyword Research for SaaS Websites

SaaS audiences search in recognizable patterns. Look for these families:

• Problem-aware: “emails going to spam”, “low open rates” — the pain exists, the solution category does not yet.
• Solution-aware: “email marketing software”, “bulk sender tools” — they know the category.
• Tool queries: “keyword research tool”, email subject line tester, AI email rewriter.
• Comparison queries: “X vs Y”, “X alternatives”, “best tools for…”.
• How-to, integration and feature queries: setup, migration, “tool + platform” pairings, and capability names used verbatim.

Problem-aware queries are the easiest to underestimate: they rarely mention your product category, yet they describe exactly the moment your product becomes relevant.

Keyword Research for Ecommerce

Ecommerce keyword research usually separates five layers: product keywords (the exact item, with model, colour, material and size variants), category keywords (the shelf it sits on), commercial queries (“best…”, “reviews”), comparison queries (“X vs Y”, alternatives, compatibility), and informational support — sizing, care, use cases and troubleshooting that help buyers decide and prop up the category pages.

Keep informational guides distinct from product and category pages when their purposes differ. A commercial modifier in a generated phrase suggests buying interest; it does not prove purchase intent or profitability.

Keyword Research for Email Marketing

If your business sends email, keyword research connects SEO to the channel itself. Common seed areas include email marketing and newsletter strategy, subject lines and preview text, deliverability and sender reputation, SMTP and authentication (SPF, DKIM, DMARC), templates and HTML emails, cold email, automation, and email verification.

Those topics are also where your audience needs help most, which is why they connect so naturally to practical tools: a subject line tester for the writing step, an Email Deliverability Checker for pre-send diagnostics, a spam checker for content risk, and email verification for list quality. For the strategy side, see our guide to SPF, DKIM and DMARC.

Keyword Research for AI Search and Answer Engines

Content discovery no longer happens only on results pages. People meet answers in featured snippets, AI-generated search experiences, conversational assistants and dedicated answer engines. Keyword research still matters for all of them — you still need to know which questions are being asked. What changes is how you answer them:

• Give clear answers first, then the detail, so a summary or excerpt has something accurate to quote.
• Organize content around questions with descriptive headings that match how people ask.
• Build topical context — pages covering a subject thoroughly are easier to interpret than isolated posts.
• Use concrete examples and original evidence; generic text adds nothing worth citing.
• Keep facts current and state sources, because these systems re-use claims verbatim.
• Structure information with tables, lists and definitions that are easy to extract.

None of this guarantees inclusion in any AI-generated answer. It makes your content easier to understand, verify and quote.

How to Use the MailCannon Keyword Research Tool

MailCannon's Keyword Research Tool turns one topic into a structured list of related ideas you can filter, group and export. It is free to use without an account; requests are rate-limited (about ten searches per minute) to keep the service stable.

1. Enter a seed keyword or topic. One to 120 characters, for example email marketing.
2. Choose the language. Discovery works in English, French, Spanish and Arabic, and generated wording follows the language you pick.
3. Start the research. Press Find Keywords, or choose a suggested topic (Email Marketing, Cold Email, Email Deliverability, SMTP, Lead Generation, Digital Marketing, SaaS, Ecommerce).
4. Review the results. Summary cards show keyword ideas, commercial signals, questions and long-tail keywords. Each row lists the keyword, its source, its inferred intent and a MailCannon opportunity score.
5. Switch views. All keywords shows everything, Questions & GEO focuses on question and answer-shaped queries, and Content ideas suggests article directions from your results.
6. Filter and sort. Narrow by text, intent and type, then sort by relevance, opportunity or alphabetically.
7. Select and export. Tick the rows you want and use Copy selected, Copy all or Export to download CSV, JSON or TXT. Copy search link turns your query into a shareable URL.
8. Validate before publishing. Check the real results pages, your audience data and a trusted demand source before you commit to a target.

What the tool shows — and what it does not

• Source transparency. Wikipedia rows are topic titles retrieved from Wikipedia's search API — related topics, not search-engine autocomplete. Generated rows come from language templates and are labeled as generated ideas.
• No invented numbers. No search-volume, CPC or difficulty provider is connected, so none of those metrics are displayed. The Market selector is disabled accordingly: discovery is language-based, not country-based.
• Heuristics are labeled. Intent, long-tail and question flags are inferred from wording, and the opportunity score is a documented MailCannon formula — not Google data and not a ranking probability.
• Optional local history. Recent searches are stored only if you enable them, stay on your device, and can be cleared at any time.

Already have a website and want to see how it performs today? Run a Website SEO Check to review technical SEO, metadata, links and indexability — keyword research tells you what to say, a site check tells you whether search engines can read it.

Common Keyword Research Mistakes

• Choosing keywords only because their volume looks impressive.
• Ignoring intent and publishing a product page where readers wanted an explanation.
• Creating a separate page for every variation of the same phrase.
• Trusting one tool's metric as if it were an exact measurement.
• Dismissing long-tail queries because the numbers are small.
• Ignoring the content you already have, then duplicating it.
• Stuffing keywords into copy until it reads like a formula.
• Targeting topics unrelated to what you actually offer.
• Treating CPC as evidence of SEO value.
• Planning a whole quarter around one estimate.

Keyword Selection Checklist

Before targeting a keyword, ask:

• Is it relevant to this website and what we actually do?
• Does it match the audience we want to reach?
• What is the search intent, and do the current results confirm it?
• Can we create genuinely useful content for it?
• Do we already have a page targeting the same intent?
• Is the keyword too broad to answer properly on one page?
• Are there useful long-tail variations we should cover instead or alongside?
• What questions surround the topic?
• Does it support a business or editorial objective?
• Are the metrics reliable enough to guide this decision — or should we verify them first?

Frequently Asked Questions

Conclusion

Keyword research is not about finding a magic phrase. It is a disciplined way of learning how your audience describes its problems, and of deciding which pages should answer which questions. Start with a seed, expand it into questions and long-tail variations, read the intent behind each one, group what belongs together, and treat every metric as an estimate rather than a fact.

Put it into practice with the Keyword Research Tool, then pair it with a Website SEO Check to make sure search engines can read what you publish. Our guides to email marketing and email deliverability show how the same research habit applies to the messages you send.