Write short notes on the following: Types of cloud computing services

Types of cloud computing services: Cloud computing technology enables the reusability of IT resources for storing large databases, developing and hosting complex applications, and expanding computational power and other services on demand. Eliminating or reducing investments on large-scale infrastructure and software, coupled with the pay per-use model, significantly reduces IT costs. Cloud computing services fall into 3 categories: Infrastructure-as-a-service (IaaS): IaaS is the most basic category of cloud computing services that allows you rent IT infrastructure (servers or VM's) from a cloud provider on a pay-as you-go basis. Platform as a service (PaaS): Refers to the supply an on-demand environment for developing, testing, delivering and managing software applications. It is designed to quickly create web or mobile apps, without worrying about setting up or managing the underlying infrastructure of servers, storage, network and databases needed for development. Software as a service (SaaS): SaaS a method for delivering software applications over the Internet as per the demand and on a subscription basis. SaaS helps you host and manage the software application and underlying infrastructure and handle any maintenance (software upgrades and security patching).