How Search Engine Works?
Search engines have two main functions-crawling and building an index & offering search users with a ranked list of websites which they consider as relevant. The example of a Search engine is Google, Yahoo, Bing, AOL etc.
Importance of keywords for the search engine
In SEO, keywords are used for connecting you with your targeted audience. They help in creating a relationship with your target audience and have your web page indexed by search engines. Users look for words or phrases. So, if your website is well optimized, your pages will appear in search results.