What is Search Engine

What is SEARCH ENGINE?

• A search engine is an online tool or we can say it is a web-based tool that helps users to find information related to their query on the World Wide Web.
• Google, Yahoo, Bing are the famous and most commonly used search engine and there is an assumption made by experts that 75% of users use Google as their Search Engine whereas only 25% of users uses Bing and Yahoo as their search engine. 
• AOL, WOW, WebCrawler, MyWebSearch, InfoSpace, Info, Dogpile, DuckDuckGo, Blekko, Conteko, Alhea are the other examples of the search engines.

Working of Search Engine:-

1. Crawler or Spider-

• First, your website's whole source code is crawled by Crawler or Spider and then they save it to the local server after reading the whole website source code.

2. Indexer-

• The role of Indexer is to collect data from the local server and perform indexing of your website in a specific category where it belongs.
• For instance if your website is based on a hotel indexer will index your website in the hotel category or if you have a school website indexer will put your website in the school category.
• When the indexing is finished indexer saves data to the main server.

3. S.E.R.P-

• S.E.R.P is an acronym for Search Engine Result Pages.
• Ranking Algorithms decides the ranking of the websites to be shown on Search Engine Result Pages (S.E.R.P).