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IaaS, PaaS, and SaaS are cloud service models that differ in the level of control and responsibility.  IaaS provides virtualized computing resources, PaaS offers a platform for application development, and SaaS delivers software applications over the internet .   IaaS (Infrastructure as a Service): Definition:  Provides virtualized computing resources like servers, storage, and networking. Responsibility:  Users manage the operating systems, applications, and data. Example:  Virtual Private Cloud (VPC) by AWS.   PaaS (Platform as a Service): Definition:  Offers a platform for developers to build, deploy, and manage applications.   Responsibility:  Users manage the applications and data, while the provider manages the underlying infrastructure and operating systems.   Example:  Azure App Service, Google App Engine.   SaaS (Software as a Service): Definition:  Provides access to software applications ...

In cloud computing, SaaS, or Software as a Service,  delivers software applications over the internet on a subscription basis, eliminating the need for installation and maintenance . Users access the software through web browsers or other client applications, and the service provider handles all aspects of the software's infrastructure, security, and updates.   How SaaS Works: 1.  Subscription-based Access: Users subscribe to the SaaS application, typically on a monthly or yearly basis.   2.  Internet Access: Users access the software through a web browser or other client application, such as a mobile app.   3.  Provider-Managed Infrastructure: The SaaS provider manages all aspects of the software's infrastructure, including servers, storage, and networking.   4.  Data Storage: Customer data is stored on the provider's servers.   5.  Updates and Maintenance: The provider handles software updates, bug fixes, and othe...