What is Major Funtions of a Search Engine.
 

I want learn SEO and SMO.

Search Engine allows the Internet users to find specific information from the web based on keyword criteria that is entered by the user

Search engines function on the Internet by allowing Internet users to find specific information from the Web based on keyword criteria that is entered by the user. Search engines don't function on the Internet, but they provide databases for people who are seeking information that can be found on the Web.

Crawling
Crawling is the process search engines discover updated content on the web, such as new sites or pages, changes to existing sites, and dead links.
To do this, a search engine uses a algorithm that can be referred to as a 'crawler', ‘bot’ or ‘spider’ which follows an algorithmic process to determine which sites to crawl and how often. As a search engine's crawler moves through your site it will also detect and record any links it finds on these pages and add them to a list that will be crawled later. This is how new content is discovered.

Indexing
once a search engine processes each of the pages it crawls, it compiles a massive index of all the words it sees and their location on each page. It is essentially a database of billions of web pages.
This extracted content is then stored, with the information then organized and interpreted by the search engine’s algorithm to measure its importance compared to similar pages.These are the major functions of search engine.

Great post with good information

Crawling is the process search engines discover updated content on the web, such as new sites or pages, changes to existing sites, and dead links.

Search Engine Don't function on the internet, but they provide database for people who are seeking information that can be found on the web