Wikipedia:Purpose

This is an information page. It is not one of Wikipedia's policies or guidelines; rather, its purpose is to explain certain aspects of Wikipedia's norms, customs, technicalities, or practices. It may reflect differing levels of consensus and vetting.

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Wikipedia's purpose is to benefit readers by acting as a widely accessible and free encyclopedia; a comprehensive written compendium that contains information on all branches of knowledge.

Encyclopedias are designed to introduce readers to a topic, not to be the final point of reference. Wikipedia, like other encyclopedias are tertiary sources and provides overviews of a topic by indicating reliable sources of more extensive information.

The goal of a Wikipedia article is to present a neutrally written summary of existing mainstream knowledge in a fair and accurate manner with a straightforward, "just-the-facts style". Articles should have an encyclopedic style with a formal tone instead of essay-like, argumentative, promotional or opinionated writing.