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Search Engine

TL;DR

Search Engines allows people to discover content across the web through their software system based on keywords and phrases given by the searchers and the sites' relevance.

What is a search engine?

A web search engine or Internet search engine is a software system designed to carry out web search (Internet search) based on a query (keyword or phrase) and display the most relevant websites as a result.

How do search engines work and how many of them are there?

Search engines get the information from spider (crawlers) by crawling websites from a link to another one, and by checking the sitemaps and robots.txt files. 
Once the crawlers gather information about the information, they send back the data to be indexed based on the titles, meta description, and other meta-tags, content, alt-attributes, site structure, headings, CSS, and Javascript. All sites are ranked based on their relevance for the searchers and the index report.

The world's most frequently used search engines are:

  • Google
  • Bing
  • Yandex
  • DuckDuckGo
  • Yahoo!
  • Baidu
  • Naver
  • SearchEncrypt
  • StartPage