How does search engine works?

How does search engine works?

-  A search engine works by looking up information on the internet based on what you ask it to look for. You type words or phrases you want more information about in the search box, click on search, and get the results. 


-  A search engine does exactly what its called - it searches certain parts of the internet database based on the words you are searching for information on. For example, if you want football stats, it's not gonna bother looking on Cosmopolitans website, and likewise if you wanted makeup hints, they wouldn't check NFL.com.


source
http://www.ask.com/questions-about/How-Does-a-Search-Engine-Work

Have you ever been looking for something and wished you had help searching for it? It is a common feeling that led to the creation of one of the most effective parts of the Internet--search engines.

 Search engines are as vital to the Internet as the websites they take you to. Without them, it would be difficult to surf the Net for anything. Search engines work so well due to the software programs used to run them.

 Software programs like Alta Vista and Google help search engines look for information on the World Wide Web. These software programs index information and send out "crawlers" to search for new information added to the web. Crawlers find new websites and web pages based on SEO (search engine optimization) or Meta tags.

 Search engines use SEOs or Meta tags to locate "old" and "new" websites. SEOs are words and phrases that appear on a web page or website that are indexed by search engines in a way that best describes it. Savvy bloggers often use key SEO phrases in the title of their blog and throughout it to help search engines better categorize their subject and blog. Meta tags are words added into a special section of a web page or website by the designer to describe it. Meta tags are not visible to an Internet surfer, but are visible to a crawler.

 After a crawler finds a website or web page, it is indexed into the search engine system under a category or categories. So a web page with the title "Toys for Puppies" would most likely be listed under the categories "toys" and "puppies." The crawler would decide to do this based on the terms in the title. Then, when a person surfing the Net for information lists the words "toys" and "puppies" in the search engine box, this page would pop up in the results.

 There are times when a website or web page that appears to have nothing to do with a specific search pops up in the results screen. This usually happens when the SEOs or Meta tags are not in line with the subject matter. Also, there are times when a web page or website is missed. However, the designers of search engines have remedied this problem by adding areas on their own specific pages to allow users to submit their web page or website to them. Basically, the makers of the search engines want to be sure that they are able to serve anyone who comes to them by providing the most accurate information available on the World Wide Web