Ever make clear to a professional person you impoverishment to insight out roughly the Bermuda Triangle? Or maybe locating perennial bulbs? Or raising pit bulls? It probably didn't issue what you were interested in, the professional person could ingredient you in the correct way. Yet that's all she did, tine you in the appropriate path. She didn't detail you the response to your questioning. Why? Because she hasn't memorized all the books in the library!
That's what a force out motor is same (kind of).
You ask it a inquiring going on for anything, and it will tongue final where on earth you can go to countenance for it (or 100 000 places you can go to gawp for it). The bibliothec told you to appearance in such as and such a portion of the library, while the flush motor provides links you clink on to go to specialized websites.
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The professional person knows where on earth to spine you because the room is reorganized into diverse areas of agreed interest, and the books are formed in a specific writ. But the Internet is a undersized more than willy nilly than that. And that makes the prod engine's job a lot more fiddly than the librarian's. Why?
Because that technique the prod engine has to read and con all the webpages first, so that it knows what's in them. That way, once you ask in the region of pit bulls, the rummage engine doesn't a moment ago prickle you toward the "pets" interest. Instead it says, "Ah, pit bulls. Of the 8 billion webpages I've read recently, here are the ones that talked almost pit bulls."
Obviously the hunting engine has to have a beautiful suitable memory. Actually, it uses a database, which is just a way for computers to pool statistics into unique slots for express and unproblematic retrieval next. When the check out motor "reads" through all the webpages forthcoming out there, it makes line of what those webpages discuss just about. So once you ask just about planting perennial bulbs, it's no hitch for the survey motor to hunt done its own information of intelligence and confer golf links for you to go to the greatly identical pages it's at one time skim that accord beside tulips and the look-alike.
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And that's why a hunt engine is like a bibliothec.