How Search Engine Work

There are three main parts of any search engine...........

1-Caching of Website Pages (Done by the crawler)
2-Indexing of Website Pages (Done by the Indexer)
3- Google Algorithms

1-The first step of search engine is read the pages of a web site.This work is done by the search engine crawler.
2-After caching of web site pages, these pages are stored in data base, this is done by Indexer.
3-Then after the indexing of web pages search engine gives the value to the particular web page, then according to the value these pages are seen in the search engine results.