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Definition: An internet-based tool that searches an index of documents for a particular term, phrase or text specified by the user. Commonly used to refer to large web-based search engines that search through billions of pages on the internet.
Different than a Directory
Spider, Indexer, Database, Algorithm
Find matching documents and display them according to relevance
Frequent updates to documents searched and ranking algorithm
Strive to produce “better”, more relevant results than competitors