A keyword is a word or phrase that users type into a search engine to look for information, products or services. In the SEO context, the term describes the search queries a website is deliberately optimised for, so that it appears at the top of the search results for exactly those inputs. The right selection, structuring and placement of keywords is one of the most fundamental levers of every successful search engine optimisation. Whoever instead randomly stuffs “as many keywords as possible” onto a page risks the opposite – modern algorithms detect keyword stuffing reliably and punish it.
Keyword types
By length
| Type | Example | Volume | Competition | Conversion chance |
|---|---|---|---|---|
| Short tail / head | “software” | very high | very high | low |
| Mid tail | “custom software development” | medium | medium | medium |
| Long tail | “custom software development agency Stuttgart” | low | low | very high |
Long-tail keywords bring less volume but considerably more qualified traffic – users with concrete intent. In practice, most websites rank the majority of their organic traffic through hundreds of different long-tail queries, not through the one dream keyword.
By search intent
Google increasingly evaluates keywords by the intention behind them:
- Informational (“What is a progressive web app?”) – the user seeks knowledge → long, explanatory content ranks
- Navigational (“YouTube”) – the user wants to reach a specific site → brand keywords
- Transactional (“web agency Stuttgart quote”) – the user is ready to buy → service/product pages rank
- Commercial investigation (“best web agency Stuttgart comparison”) – the user compares providers → listicles, reviews rank
Optimising a service page for a purely informational keyword runs past the search intention, and will rank poorly despite the matching words.
Further categories
- Branded keywords: contain the brand name (e.g. “aceart web agency”)
- Non-branded keywords: generic terms (e.g. “web agency Stuttgart”)
- Local keywords, with a location reference (“web agency Stuttgart”)
- Voice search keywords: question form (“Who builds custom software in Stuttgart?”)
Keyword research
A good keyword strategy always starts with research – data instead of gut feeling.
Typical tools
- Google Keyword Planner: free, good for search volume estimates (data in buckets)
- Google Trends: relative search frequency, regional distribution, seasonal patterns
- Ahrefs, Semrush: paid, very deep data, competitor analysis
- Ubersuggest, AnswerThePublic: affordable alternatives, good for long-tail ideas
- Google Search Console: which keywords already bring traffic to your site?
Evaluation criteria per keyword
- Search volume: how often is it searched?
- Competition: how many established competitors already rank?
- Search intention: does the keyword fit your page?
- Conversion potential: how likely is someone to buy after this search?
- Your own strength: do we have the content/authority to rank for it?
Placing keywords correctly
Once the target keyword is set, it belongs in the following places:
- Title tag: once, ideally at the start
- Meta description: once, in natural form (see meta tag)
- H1 heading: once, prominently
- H2/H3 headings: where it fits organically
- Body copy: several times, but naturally; sprinkle in synonyms and semantically related terms
- The URL slug, ideally containing the keyword
- Image alt attributes: where images fit the topic
- Internal link texts: anchors related to the keyword
Keyword density: myth vs. reality
For a long time, an “optimal” keyword density of 1–3% was gospel. That rule is outdated. Today, semantic relevance counts: via models such as BERT and MUM, Google understands a page’s topic and recognises related terms. A page about “custom software” should naturally also contain words like bespoke software, tailor-made, business application, API, interfaces, not bluntly repeat the main keyword twelve times.
Avoiding keyword cannibalisation
When several of your own pages are optimised for the same keyword, they “cannibalise” each other – Google doesn’t know which should rank, and none reaches its full strength. Symptoms: frequently changing positions, declining CTR, no clear climb despite a strong backlink profile. Solution: one consolidated page per keyword; merge weaker variants via 301 or rework them into informational content.
Frequently asked questions about keywords
How many keywords should a page have? One primary keyword + 3–5 related secondary keywords usually suffice. More important than the number is topical depth – Google ranks a page that covers a topic comprehensively higher than one stuffing ten unconnected keywords.
Are meta keywords in the <head> enough?
No. Google has ignored the meta keywords tag since 2009. Other search engines treat it similarly. The tag is practically without effect today.
How long does it take for keyword optimisation to work? For low-competition long-tail keywords, often 4–8 weeks. For hard short-tail keywords, several months to years. Patience and continuous care are mandatory.
What’s the difference between a keyword and a search term? “Keyword” is the term from the SEO optimiser’s perspective. “Search term” (or “query”) is the user’s actual input. The two can be identical but don’t have to be.
Conclusion
Keyword work is a mix of data research, editorial care and a long breath. The right keywords open the door to qualified, permanently free traffic, but only when the search intention fits the page and the content actually answers it. We’re happy to support you with keyword research, content mapping and holistic implementation – take a look at our SEO services or get in touch for a no-obligation consultation.