How to search engine works.
Search engines do two major functions they are,1.crawling & building an index
2.providing answers by calculating relevancy & serving results
search engines have automated robots called as crawlers. This crawlers can reach the many billions of interconnected web applications and index data about that web applications. Search engine works as answer machines. Ones asks a question from a search engine, it gives ton of answers from data that crawlers indexed. that answers process according to the relevance and importance.
