Search engines determine keywords through a process called "indexing." They use sophisticated algorithms to crawl websites, analyze the content, and determine what words and phrases are frequently used and relevant to the content on the page. These keywords and phrases are then stored in the search engine's index, and used to match search queries with relevant content. Other factors such as the relevance, freshness, and authority of the content can also impact keyword rankings in search results.
In addition to indexing and analyzing website content, search engines also consider other factors to determine keywords.
Overall, search engines employ a combination of automated processes, user data, and advanced algorithms to determine keywords and deliver the most relevant search results to users.
Great answer! Just to add to that, search engines also consider on-page elements such as page titles, headings, and meta descriptions to determine keywords. These elements provide important signals about the content of a webpage and help search engines understand what the page is about. Additionally, search engines may also use external signals such as backlinks, social media signals, and user engagement metrics to determine keywords. These signals provide insights into the popularity and relevance of a webpage and can influence keyword rankings in search results.