A keyword is the phrase someone types or speaks into a search engine when they are looking for something. The same phrase shows up on your side in two places: in SEO, where a page is written to answer that search, and in paid search, where you bid on it so an ad can appear. Google Ads separates the two ideas with its own vocabulary: the keyword is what you add to a campaign, and the search term is what the person actually typed. The two rarely match word for word.
Keywords carry intent. Someone searching "roof leak repair near me" wants a roofer today, while "how long does a shingle roof last" is researching and may not buy for years. Reading intent correctly matters more than counting searches, because a phrase with modest volume and clear intent often brings more customers than a broad phrase with a large audience. Keywords also show up in Quality Score, in landing page planning, and in the search terms report you should review every month.
Mechanics
How keywords connect searches to pages and ads
Search engines look at a query, work out what the person means, and rank pages they judge to answer it. A page earns a keyword by covering the topic clearly, by matching the words people use, and by having enough authority through backlinks and internal links to be trusted. In paid search the process is more mechanical: you add keywords with a match type, and the platform decides which searches are close enough to trigger your ad. Broad match casts a wide net, phrase match keeps the meaning, and exact match stays close to the words you entered.
Three things move the value of a keyword. Volume tells you how many people search it in a month. Intent tells you how close they are to buying. Competition tells you how hard the ranking or the auction will be. A roofing company in one metro area cares about a few dozen phrases, not a few thousand, and the ones with "repair", "replacement" and a city name usually do the work. Tracking rankings and clicks per keyword in Search Console shows which pages are earning their place and which ones need a rewrite.
Example
A worked example for a roofing company
Say a roofing company is deciding between two phrases for its next page. Assume "roofing" gets 6,000 searches a month in its region, and "roof replacement cost" gets 900. The broad phrase includes students, homeowners comparing materials, and people looking for jobs, so assume 1 percent of visitors request a quote. The narrower phrase is closer to a decision, so assume 6 percent request a quote.
If the page ranks well enough to capture 5 percent of each phrase's searches, the broad phrase brings 300 visits and 3 quote requests per month. The narrow phrase brings 45 visits and about 2.7 quote requests, call it 3. The two phrases produce nearly the same number of leads, but the narrow one needs a fraction of the traffic and is far easier to rank for. Now assume the company can rank for ten such narrow phrases within a year: that is roughly 30 quote requests a month from pages that each answer one specific question.
Use
When keywords help and when they mislead
- Use keyword research to decide which pages to build and what to call them, so each page answers one search intent instead of trying to cover everything at once.
- Use the search terms report in Google Ads to find what people actually typed, then add the good phrases as keywords and the irrelevant ones as negatives.
- Volume misleads when it is measured nationally but your business serves one county, because a phrase with 10,000 searches a month may have 50 that matter to you.
- Ranking position misleads on its own, since a first-page spot for a phrase nobody searches in your area brings no calls.
Watch out
Common mistakes with keywords
- Chasing a single head term such as "roofing" for years while ignoring the dozens of specific phrases that bring people ready to call.
- Stuffing a page with the same phrase over and over, which reads badly and no longer helps the page rank.
- Bidding on broad match keywords without a negative keyword list, so the ad shows for job searches, DIY questions and unrelated products.
- Treating a keyword list as finished, when search language shifts and new phrases appear every season.
- Building one page for many unrelated keywords, so it ranks for none of them and confuses the visitor who lands on it.