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ThreeservicemodesofcloudcomputingACIaaS（

InfrastructureasaService）PaaS(PlatformasaService)BSaaS(SoftwareasaService)2Threeservicemodesofcloudcomputing31.IaaS（InfrastructureasaService）providesuserswithcomputing,storage,networkandotherITinfrastructureresourcesUsersdonotneedtomanageandcontroltheunderlyinghardwaredevices,butcancontroltheoperatingsystemandApplications.CloudhostcanrunwindowsorLinuxoperatingsystemAtpresent,themostrepresentativeIaasproductsincludeAmazonEC2virtualmachine,S3cloudstorageabroad,Alibabacloud,Shengdacloud,baiducloud,etc.Threeservicemodesofcloudcomputing41.IaaS（InfrastructureasaService）Enterprises,unitsandindividualsdonotneedtobuildcomputerrooms,purchaseservers,storageandotherequipmenttoinstallandrunsoftwaresystems,theycanrentfromcloudcomputingserviceprovidersaccordingtotheirownneeds.Userscanincreaseorreducetheperformanceandquantityofleasedequipmentaccordingtotheirownbusinessneeds,whichisflexible,convenientandcostsaving.Threeservicemodesofcloudcomputing52.PaaS（PlatformasaService）PaaSprovidesuserswithapplicationdevelopmentandoperationenvironmenttorealizeapplicationdeploymentandoperation.PAASismainlyforsoftwaredevelopers,whichenablesdeveloperstofocusonapplicationdevelopmentandgreatlyimprovesthedevelopmentefficiencyofapplications.Atpresent,themostrepresentativePAASproductsincludeoverseasGoogleAppEngine,MicrosoftWindowsazure,domesticSinaSAE,etc.Threeservicemodesofcloudcomputing62.PaaS（PlatformasaService）PAASactuallyreferstothesoftwaredevelopmentplatformasaservice,whichissubmittedtousersinSaaSmode.Therefore,PAASisalsoanapplicationofSaaSmode.However,theemergenceofPAAScanspeedupthedevelopmentofSaaS,especiallythedevelopmentofSaaSapplications.Userscanusetheplatformprovidedbycloudcomputingserviceproviderstodeveloporrunsoftware,whichcanbeusedbythemselvesorprovidebusinessservicesforothers.Forexample,manypeopleuseApple'scloudcomputingplatformtodevelopgoodapplicationsandmakeprofitsbyservingothers。Threeservicemodesofcloudcomputing7Threeservicemodesofcloudcomputing3.SaaS（SoftwareasaService）SaaSprovidesuserswithapplicationprogramswithspecificfunctions,whichcanbeaccessedthroughbrowserorthinclientinterfaceonvariousclientdevices.SaaSismainlyfortheenduserswhousethesoftware.Usersonlyneedtocareabouttheusemethodofthesoftware,notthebackgroundserverandhardwareenvironment.Atpresent,themostrepresentativeSaaSproductsincludeoverseasSalesforceonlinecustomermanagementservice(CRM),domesticKingdeeERPcloudservice,800customeronlineCRM,etc.8Threeservicemodesofcloudcomputing3.SaaS（SoftwareasaService）SaaSisamodeofprovidingsoftwarethroughtheInternet.Insteadofpurchasingsoftware,usersrentweb-basedsoftwarefromproviderstomanagebusinessactivities.Forexample,smallandmedium-sizedenterpriseuserscanrentfinancial,human,office,customerrelationshipandothersoftwarewithasmallamountofmoney,withou

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