CLOUD COMPUTING SERVICE
Saas
Software as a service (SaaS) is a software distribution model in which a third-party provider hosts applications and makes them available to customers over the Internet.
PaaS
Platform as a service (PaaS) is a cloud computing model in which a third-party provider delivers hardware and software tools -- usually those needed for application development -- to users over the internet.
IaaS
Infrastructure as a service (IaaS) is a form of cloud computing that provides virtualized computing resources over the internet.