HOW SEARCH ENGINE WORK

At the point when a client enters a question into a web search tool, a web index results page (SERP) is returned, positioning the discovered pages arranged by their importance. How this positioning is done contrasts across web indexes. Web search tools regularly change their calculations (the projects that position the outcomes) to further develop client experience. 

HOW SEARCH ENGINE  THREE TASKS AND PRIMARY FUNCTIONS 

CRAWLING

A crawler is a program utilized via web indexes to gather information from the web. At the point when a crawler visits a site, it picks over the whole site's substance . And search engine crawl the internal discover the content like web pages and images and videos.and which search engine use the computer program is called bots ( short for robot ) crawlers spider to make their way through the pages .

INDEXING

Indexing is a secondary part of the process the index is a gigantic list of all the web pages and content found by the bots.or A list is another name for the data set utilized by an internet searcher. Files contain the data on every one of the sites that Google (or some other web crawler) had the option to discover. On the off chance that a site isn't in an internet searcher's record, clients won't discover it. 

RANKING

Rankings in SEO alludes to a site's situation in the internet searcher results page. There are different positioning elements that impact whether a site seems higher on the SERP dependent on the substance significance to the inquiry term, or the nature of backlinks highlighting the page.

RESULT

After crawling, indexing and ranking searching and show the results.