How does search engine perform?

[stefijain]

Search engines match queries against an index that they create. The index consists of the words in each document, plus pointers to their locations within the documents. This is called an inverted file. A search engine or IR system comprises four essential modules:

[wearticles]

Search engines find the queries of searchers through web spiders where it should be valid.

[sofyjohnson18]

When a person looks for something online, it requires the search engines to scour their corpus of billions of documents and do two things – first, return only those results that are relevant or useful to the searcher’s query, and second, rank those results in order of perceived usefulness. It is both “relevance” and “importance” that the process of SEO is meant to influence.

[james258]

Serch engine performs on relevancy, coverage, freshness, diversity and user experience