How dosearch engines work

Although search engines are basically just navigators of the internet, it would be impossible to imagine the internet without them. Due to the sheer size and depth of the World Wide Web, this very wealth of information becomes meaningless or unusable without search engines. Search engines basically perform three tasks:
1) They search the World Wide Web using specific words or phrases.
2) They index the results they find and their locations.
3) They provide user access to this index and the ability to search it using combinations of words or phrases of their choosing. Today search engines perform up to ten million queries every given day and are constantly in a process of evolving and reinventing their services to balance the needs of websites, users, and advertisers. It all starts with something called spiders (also called crawlers) and how appropriate,having in mind that the internet is called the World Wide Web. Spiders are inter-bots or robots composed of software or coding. Just like real spiders, internet spiders do something called web crawling or just crawling,to make huge lists of what is found where on the internet. Crawling is the act of browsing, indexing and copying done by spiders.
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