The concept of "neutral point of view" (NPOV) is a tricky one in this modern media environment, where "fair and balanced" is at best improbable and sometimes cause to snicker.
NPOV on Wikipedia is non-negotiable, and means that Wikipedia content should be fair, proportionate, presented in non-judgmental language, with facts and opinions clearly separated.
Wikipedia prefers a "just the facts" approach, but discussing opinions is sometimes necessary. In such cases, entries should explain differing viewpoints, rather than promoting one or another. But also keep in mind: "false balance" is no balance at all.
Sound like a Pandora's box? It kind of is, so the main policy itself runs to more than 5,000 words, and there is a dedicated "noticeboard" for debating contested topics. And we haven't even got to fringe theories yet—another time!