A search engineis a tool that searches the Web for websites relevant to real-time queries entered by users. Depending on the search string, search engines return results, which are called search engine results page (SERPs). Usually the engines get it right and display the most relevant results. There are no fixed rules used by the search engines to display accurate results.
Spiders or crawlers are robots that search for and index website content. The most popular search engines are Google, Yahoo!, and Bing. ...
