SEARCH ENGINES
web search engine is a software system that is designed to search information on the World Wide Web.
The search results are generally display on search engine result page (SERPs) line by line format.

The information may be a mix of text,webpages, images, and other types of files.

some top search engines in the world

  • Google
  • Yahoo
  • Bing
  • Aol
  • Yandex
  • Ask
  • Baidu
  • Wolframalpha
  • Duckduckgogo
  • Intrenet archive

How search engines works ?
search engines made up of many components called softwares, in that the major softwares are 

  • Crawlers or bots or spiders
  • Indexers
  • Algorithms    

Purpose of Crawlers :
To collect ad study the data from world wide web and webmaster tools

Purpose Indexers
the main purpose to classified the data 

Purpose of algorithms :
to avoid spammy or malware site rank in serp to support web sites in ranking , and to support browsers base on his query

Examples of algorithms:Page rank,Spell check,Synonym check,Auto complete,Query understand,Safe search,user context,Malware detection algorithms.

You can find the the crawling status of your web site you can find by

You can find your site indexed pages in search engines

Aboutpage rank:
default page rank for any web site is 0.15 internally
The real page rank generally consider is 0-10
2016 on words google has discontinued to show the page rank visibility in any toolbar

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