Infrastructure as a service (IaaS) is a cloud offering where a vendor provides users access to the computing resources like servers, storage and networking. Companies/businesses can use their own platforms and applications within a service provider’s infrastructure. IaaS can be provisioned and managed over the internet as an instant computing infrastructure.
IaaS can be quickly scaled up and down as per the demand. IaaS service lets you pay only for what you use and helps to avoid the expense and complexity of buying and managing your own physical servers and other data-centre infrastructure. Resources are offered as a separate service components and customer only need to rent & pay for a particular one for as long as customer needs it.
Platform as a service (PaaS) cloud computing offers a cloud environment in which customers/users can develop, manage and deliver their applications. Users can use a suite of prebuilt tools to develop test and customize their own applications as can also use storage and other computing resources.
PaaS allows customers to avoid the heavy expense and complexity of buying and managing software licenses and underlying infrastructure for their application. Customers can manage their applications and services and the cloud service provider typically manages everything else.
Software as a service (SaaS) is a cloud computing service that provides customers/users the access to a cloud vendor’s cloud-based application software. Customers/Users do not require to install the applications on their local systems or devices. The applications reside on a cloud network and can be accessed through the web like email, calendaring and office tools (such as Microsoft Office 365).