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What is the difference between a search engine and a gateway?

AA search engine uses machines to index webpages; a gateway is compiled by experts or librarians.
BA search engine searches for images; a gateway searches for text only.
CA search engine is simpler to use; a gateway requires the searcher to use scientific terms.
DA search engine is free; a gateway requires payment for the subscription to the service.

Verified Answer :

A search engine enters a database of web sites, but generally speaking, a searchengine does not normally provide answers straight away. You enter a search termĀ and it brings up a number of pages which it thinks are applicable to your search

The answer is A simply because a gate way is made up of librarians and a search engine was designed. =)