Wikipedial mtbch khoa ton thni dung mbng nhiu loi ngn ng trnInternet. Wikipedia c vit v xy dng do rt nhiu ngi dng cng cng tc vi nhau, cho nn ai mun thay i nhng bi vit, ch cn c mttrnh duyt Webv kh nng truy cp Internet. D n ny, ni chung, bt u t ngy15 thng 1nm2001 b sung bch khoa ton thNupediabi nhng nh chuyn mn; hin nay Wikipedia trc thucQu H tr Wikimedia, mtt chc phi li nhun. Wikipedia hin c hn 15 triu bi vit, vi hn 3,3 triu bi trong phin bnting Anh(English Wikipedia); vothng 1 nm 2006, n c hn 750.000 thnh vin. T khi n c m ca, Wikipedia cng ngy cng ni ting[5]v s thnh cng ca n ny sinh ra vid n lin quan. Tuy nhin, c nhiu tranh lun v s tin cy ca n. Mc d vy, mt cng b vo ngy 9/8/2014 ca vin thm dYouGovsau khi kho st 2.000 ngi tiAnhcho thy 64% s ngi c hi tin vo xc thc ca thng tin trn Wikipedia, cao hn t l 61% tin voBBC, v vo nhng t bo uy tn khc nhTimes(45%),The Guardian(45%),The Sun(13%).[6]Wikipedia thng c lm ngun biphng tin truyn thng i chngnhiu khi ch trch v nhiu khi khen v nhng c tnh t do, m, d sa i v phm vi rng ri. Nhiu khi d n khng ch c ni n, nhng cng c lm ngun v ch khc. Wikipedia khuyn khch nhng ngi ng gp theo quy nh "Thi trung lp", bng cch tm tt cc quan im quan trng ti gn s thtkhch quan. Vic dng Wikipedia nhngun tham kho gy ra tranh lun v tnh m ca n lm n c th bph hoi, b sa khng ng, hoc khng bao gm cc ch u n, hoc c kin khng c cn c. N cng b ch l cthin v nht qun, t cao kin s ng hn l bng cp, s thiu trch nhim cng nh kin thc chuyn mn ca ngi vit khi c so snh vi nhng bch khoa ton th thng thng. Tuy nhin, s rng ri v cn k ca n, v tnh nng c cp nht lin tc, lm d n tr thnh ngun tham kho hu ch i vi hng triu ngi. Bt c sa i no mang tnh ph hoi s b iu tra v thng tin ph hoi s b xa ngay lp tc.