A search engine is a program which works behind the scenes to gather, index and rank information from the Internet. Search engines are typically made up of five components - a crawler, indexer, search index, query engine and search interface.

Functions of the Search Index

The search index stores all the information which the search engine requires to match and retrieve web pages. The kind of structure that it uses is called an inverted file. It alphabetizes words that appear on web pages that were already crawled, in a way reflective of an index page at the back of a book.

The Query Engine

Although this component functions as the algorithmic hub of the search engine, their true workings are kept as secret . This is done to prevent websites from unfairly influencing their own page ranks. One common type of manipulation which search engines detest is the practice of spamming. This practice may adversely affect the quality of the search results which may be displayed to the user.

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