Search engines working
Search engines work by crawling billions of pages using web crawlers. Also known as spiders or bots, crawlers navigate the web and follow links to find new pages. These pages are then added to an index that search engines pull results.
All Search engines work through three primary functions:
Crawling
Indexing
Ranking
Crawling
This stage involves scanning the sites and obtaining information about everything contained there: page title, keywords, layout, and pages that it links to – at a bare minimum.
This task is performed by special software robots called “spiders” or “crawlers”.
Indexing
Search engines process and store information they find in an index, a huge database of all the content they’ve discovered and deem good enough to serve up to searchers.
Ranking and Retrieval
Search engines are answer machines. Whenever we perform an online search, the search engines scour their database for the most relevant results. Also, it ranks these results based on the popularity of the websites. Relevance and popularity are the most critical factors to be considered by these search engines to provide satisfactory performance.