A user search for information in the search engine to get relevant information.
Users often use search engines are Google, Bing, and Yahoo.
Youtube is also the world's largest second search engine owned by Google.
Most of the users search on youtube to get a better understanding of their queries.
How do search engines work
A search engine shows information to the user but the search engine does some process and checking algorithm internally to show better results.
The search engine process will not be shown by the user.
The search engine makes copies of all the websites and stores them in the cache.
When the user searches for some information in the search engine, the algorithm is checked through the cache to show results accurately.
The three stages of search engine mechanism are:
Crawling
Indexing
Ranking
Crawling:
Crawlers is a computer software program used by the search engine to crawl the entire website.
It crawls every web page and follows the links on the website.
Crawlers are also called a spider, Google Bot, web crawlers, and robots.
Google Webmaster tool> tells the information about search engine activities, like how many web pages and links are crawled.
They will tell how many pages are downloaded by the crawlers and problem arises when crawling the webpage.
Robots.txt file allows the crawler to crawl only necessary information.
Private and sensitive information will be excluded by the robots.txt file.
XML sitemap file helps the search engine to find the website .
When an XML sitemap is submitted to search engines like Google, Yahoo and Bing are easy to crawl and index the website.
Indexing
After crawling the copies of the website stored in the database server.
We can use the copies of web pages through cache.
To index the website , a search engine algorithm is used to check the factors like inbound links, outbound links,keyword density, content quality, and factual information.
This process will not be visible to the user.
Ranking:
A Search engine ranks all the possible websites related to that user's queries.
They ranked depend upon many factors like history, location, relevant content, and links.
Users type the query in the search engine, the query is sent to the database server and it checks the ranking algorithm called relevancy, links, and website credibility.
After that search engines display relevant answers to the users.
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