In cloud computing, the cloud service provider owns, manages and maintains the assets the customer consumes them via an Internet connection, and pays for them on a subscription or pay-as-you-go basis. In traditional IT, an organization consumes IT assets - hardware, system software, development tools, applications - by purchasing them, installing them, managing them and maintaining them in its own on-premises data center. 'As a service' refers to the way IT assets are consumed in these offerings - and to the essential difference between cloud computing and traditional IT. Many mid-sized businesses use more than one, and most large enterprises use all three. IaaS, PaaS and SaaS are not mutually exclusive. SaaS, or software as a service, is on-demand access to ready-to-use, cloud-hosted application software.PaaS, or platform as a service, is on-demand access to a complete, ready-to-use, cloud-hosted platform for developing, running, maintaining and managing applications.IaaS, or infrastructure as a service, is on-demand access to cloud-hosted physical and virtual servers, storage and networking - the backend IT infrastructure for running applications and workloads in the cloud.They are sometimes referred to as cloud service models or cloud computing service models. IaaS, PaaS and SaaS are the three most popular types of cloud service offerings.
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