What is Search Engine?
Search Engine is basically software which gives us all the information on the World Wide Web. Information-It may include web pages, images, videos, locations etc. Search engine also maintain real-time information with algorithms on web crawler.
Types of Search Engines:
The first search engine was- ARCHIE. It is used for indexing FTP files.
And VERONICA was the first text search engine.
In Russia- Yandex is used with 61.9%
In China- Baidu, Japan- Yahoo!Japan so these are some search engines used in different countries but most of the countries used Google.
Google is one of the most popular with market share of 90.14%.
How Search Engine Works?
working of search engines
As I said Google is the most popular search engine so we will discuss its working. It divides its working into three stages:
I will describe these three things step-by-step. So first of all we will discuss about.
Crawling: Google have its crawler and spider to perform crawling on every web page. They work on particular algorithm. So they performed crawling without any error. What crawler do actually is each time it visit web site it makes a copy of that page and adds its URL to index. After adding URL it visits on that web site regularly after a month or two to check updates.
Indexing: After crawling, crawler’s next task is built an index. Index is like a huge book which contains copy of all the pages found by crawlers. If any webpage changes the crawler updates the book with new content.
Retrieval: This is the last stage; in this stage Google maintains all the data in beautiful manner so that whenever user searches something, gets appropriate and useful data as output. Search engines uses algorithm to improve the search results. So that useful result could reach to user. Mainly page rank algorithm is used.