How Search Engine Works?

Search engines have the software know as Spiders, Robots, Bots or the Crawlers too. All these software are same only and are called by the different names. These Robots usually use to crawl the web pages of each and every site and follow the links which are present on the web pages and collects the information about the text on the pages into their database of the search engines and ,whenever any user search for queries the search engine shows the result as per the queries. There are other Robots which use to crawl the web pages on regular basis so that they can notice the several changes which have been taken place on the web pages or notice the broken links.