Wikipedia
noun[S]
trademarkukusthenameof alargewebsitethatprovidesfreeinformationin manylanguageson manysubjects, and can bechangedoraddedto by anyone. There areexpertswhowatchforerrors, andpageson whichdisagreementsaboutsubjectscan bediscussed:
Wikipedia is a goodplacetostartto get abroadoverviewof thesubject.