SEO course › Part 2: Keyword research
The main types of keywords are seed keywords, short-tail keywords, mid-tail keywords and long-tail keywords. They differ by length, how specific they are, and how many people search them. Short, broad terms get more searches but face heavy competition, while longer, specific phrases get fewer searches but often attract visitors who are ready to act.
This lesson explains each keyword type with simple examples, shows how they fit together, and helps you decide which ones a small website should target first.
What is a keyword in SEO?
A keyword is the word or phrase someone types (or speaks) into a search engine. SEO professionals also call these “search queries” or “search terms”.
When you do keyword research, you are finding the phrases your future customers already use. You then create pages that answer those searches well. If you are new to SEO, start with our guide on what SEO is and how it works.
Keywords are usually grouped by length and specificity. That grouping is what people mean when they talk about the types of keywords.
What are seed keywords?
A seed keyword is a short, basic term that describes your business or topic. It is the starting point of your research, the “seed” that grows into a longer list.
For a home bakery in Hyderabad, seed keywords might be “cake”, “birthday cake” and “eggless cake”. You rarely target a seed keyword directly. Instead, you enter it into a keyword tool and collect the longer phrases it suggests.
To find your seeds, ask three questions:
- What do we sell or teach?
- What words would a customer use to describe it (not our internal jargon)?
- What problems does our product or service solve?
Write down 5 to 15 seed keywords before you open any tool.
What is the difference between short-tail, mid-tail and long-tail keywords?
The “tail” describes where a keyword sits on a search demand curve. A few broad terms get huge search numbers (the “head”). A very large number of specific phrases each get small numbers of searches (the long “tail”). Together, those specific phrases add up to a big share of all searches.
Short-tail keywords
Short-tail keywords (also called head terms) are one or two words, such as “cake” or “sarees”. They have high search volume, meaning many people search them each month. They are also very competitive and vague. Someone searching “cake” might want a recipe, a photo or a shop.
Mid-tail keywords
Mid-tail keywords are usually two to three words and a little more specific, such as “eggless birthday cake” or “silk sarees online”. They balance reasonable demand with a clearer meaning.
Long-tail keywords
Long-tail keywords are longer, specific phrases, often four words or more, such as “eggless chocolate birthday cake delivery Kondapur”. Each one gets fewer searches, but the searcher knows what they want. Long-tail phrases often include a location, a feature, a budget or a question.
Length is only a rough guide. What really makes a keyword “long-tail” is that it is specific and has lower search demand.
How do the types of keywords compare?
This table compares the three main keyword types for an online saree shop.
| Keyword type | Example | Search volume | Competition | Intent clarity |
|---|---|---|---|---|
| Short-tail | sarees | Very high | Very high | Unclear |
| Mid-tail | kanjivaram silk sarees | Medium | Medium to high | Fairly clear |
| Long-tail | pure kanjivaram silk saree under 15000 | Low | Usually lower | Very clear |
Notice how the long-tail keyword tells you exactly what the shopper wants, including their budget. A product or category page that matches it has a strong chance of turning that visit into a sale.
The numbers you see in tools for volume and competition are estimates. Our lesson on keyword metrics explains how to read them.
Are there other ways to classify keywords?
Yes. Length is just one lens. You will also hear these labels:
- Branded vs non-branded: branded keywords include a company name (“SyncNeck SEO course”); non-branded ones do not (“free SEO course”).
- Local keywords: phrases with a place or “near me”, such as “dentist in Pune” or “dental clinic near me”.
- Question keywords: searches phrased as questions, such as “how to store homemade cake”. See our lesson on question keywords.
- Intent-based keywords: grouped by what the searcher wants to do (learn, find a site, compare or buy). Our lesson on search intent covers the four types.
One keyword can wear several labels. “Best dental clinic in Pune for root canal” is long-tail, local and commercial at the same time.
Which types of keywords should a new website target?
A new or small website usually cannot win short-tail terms straight away. Big, established sites already hold those positions.
A practical approach looks like this:
- Start with seed keywords to understand your topic.
- Expand them into long-tail and mid-tail phrases using a keyword tool or Google’s own suggestions.
- Create focused pages for the long-tail phrases that match what you offer.
- As your site earns trust and links, target more competitive mid-tail terms.
- Let broad short-tail terms come naturally as your site grows.
For example, a dental clinic in Pune could write a page for “cost of root canal treatment in Pune” long before trying to rank for “dentist”. The long-tail page attracts fewer visitors, but more of them book appointments.
AI search features such as Google’s AI Overviews tend to appear for many longer, question-style searches. That makes clear, direct answers on your pages even more valuable.
Common mistakes to avoid
- Chasing only short-tail keywords because the search volume looks exciting.
- Ignoring long-tail phrases because each one has “only” a small number of searches.
- Using industry jargon as seed keywords instead of the words customers actually type.
- Creating a separate thin page for every tiny variation of the same long-tail phrase.
Key takeaways
- The main types of keywords are seed, short-tail, mid-tail and long-tail.
- Seed keywords are starting points for research, not usually targets on their own.
- Short-tail terms have high demand but high competition and unclear intent.
- Long-tail keywords are specific, easier to rank for and often convert better.
- Keywords can also be classified as branded, local, question-based or by intent.
Frequently asked questions
How many words make a keyword long-tail?
There is no fixed rule, but long-tail keywords are often three or four words or more. Specificity and lower search demand matter more than word count.
Should I only target long-tail keywords?
No. Long-tail keywords are the best place for a new site to start, but a healthy site covers a mix. Over time you can target mid-tail and short-tail terms too.
Are seed keywords the same as short-tail keywords?
They often overlap, since both are short and broad. The difference is purpose: a seed keyword is where your research starts, while a short-tail keyword is a term you might try to rank for.
Previous lesson: Domain name for SEO: how to choose one that helps your site grow
Next lesson: Keyword metrics explained: search volume, keyword difficulty, CPC and trend