cld dtbs s dtbs tht typclly rns n cld cmptng pltfrm nd ccss t th dtbs s prvdd s--srvc. Thr r tw cmmn dplymnt mdls: srs cn rn dtbss n th cld ndpndntly, sng vrtl mchn mg, r thy cn prchs ccss t dtbs srvc, mntnd by cld dtbs prvdr. f th dtbss vlbl n th cld, sm r SQL-bsd nd sm s NSQL dt mdl.
Dtbs srvcs tk cr f sclblty nd hgh vlblty f th dtbs. Dtbs srvcs mk th ndrlyng sftwr-stck trnsprnt t th sr.