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Traditionally,you'dbuyappslikeMSWordandstorefilesonyourownlaptop.It'slikeowningacar:you'dgetfullcontrolbutfullresponsibilityaswell.Ifyourharddrivebrokeorifyoulostyourlaptop,you'dbeoutofluck,muchlikeyou'dbeintroubleifyourcaregoesbustorgetsstolen.Andyou'dpayaflatfeenomatterhowmuchyouuse...Soevenifyourlaptopgetsrunoverbyatruck,youcanborrowanyone'scomputer,login,andaccessyourfileslikenothingevenhappened.Andyouonlypayforasmuchasyouneed:GoogleDrivegivesyour15GBofstorageforfree,andyoucanpayafewextrabucksformorespace.Inshort,it'slikeUber:accessyourstuffanywhere,ownnothing,andpayforonlywhatyouneed.Togobacktotheanalogy,cloudcomputingislikeUberfor...

——引自第95页

SaaSstandsforsoftware-as-a-service,whichisabusinessmodelwherecustomersbuysubscriptionforsoftwaretobedeliveredovertheinternet.ManytimesSaaSappsrunonline,butnotalways-recallthat,evenwiththesubscriptionmodel,thePSappstillrunsonyourownmachine.WhatdoalltheseSaaSappshaveincommon?Youcanaccessalltheseappsthroughawebbrowser,andallyourdataisstoredonothercompanies'servers.Inotherwords,SaaSisjustanothernameforappsthatruninthecloud.

——引自第103页