Wikipedia aims to be a neutral compilation of verifiable, established facts.
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WP:BRIEF
WP:INBRIEF
This means:
Content policies
Neutral point of view
No original research
Verifiability
Article titles
Biographies of living persons
Image use policy
What Wikipedia is not
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Neutral
Wikipedia does not judge or advocate specific views or opinions, or make determinations on "correctness". Where differing views exist, they are presented objectively, without bias or undue weight. Balance derives from reliable sources, not personal judgment.
Compilation
Wikipedia is an encyclopedia, consisting of articles written in a particular style. There is a process which advances articles to our goal.
Verifiable
Information must be realistically verifiable by others. This is generally done by citing from reliable sources.
Established
Original ideas, interpretations, or research cannot be verified, and thus are inappropriate for Wikipedia. Wikipedia is not a primary source; it strives to be a tertiary source.
Facts
Wikipedia documents facts; it does not offer editorial opinions. Articles state the important views which exist, and who holds them ("facts about opinions").
See alsoedit
Wikipedia:Administration – Discuses both the human administrative structure of Wikipedia, and its non-human components.
Wikipedia:Biographies of living persons – About how editors must take particular care when adding information about living persons to any Wikipedia page.
Wikipedia:Purpose – Describes Wikipedia's motive for being.
Wikipedia:Here to build an encyclopedia – About how Wikipedians are here to build an encyclopedia, i.e., a neutral public reference work on certain topics.
Wikipedia:Five pillars – The fundamental principles of Wikipedia summarized in five "pillars".
Wikipedia:The rules are principles – About how policies and guidelines exist only as rough approximations of their underlying principles.
Wikipedia:What Wikipedia is not – The page outlines certain things that Wikipedia is not.
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Unofficial summaries of Wikipedia rules
Wikipedia in brief
Core content policies
All policies, in brief
Conflict of interest tips (see also Jimbo on paid advocacy)
Medical editors' guide
New editors' guide
No personal attacks (attack the edit, not the user)
Notability, reliable sources, and independent sources
What Wikipedia is not
Simplified Manual of Style
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Wikipedia principles
Five pillars Statement of our principles
Jimbo's statement Historic principles
Simplified ruleset Synopsis of our conventions
Wikimedia principles Common to all projects (in Meta-Wiki)