The three Cloud service models are IaaS, PaaS, and SaaS. IaaS (or Infrastructure as a Service) provides you with your own server environment without the need to administer the physical part of the infrastructure (datacenter, climate control, electricity, server room, etc.) With IaaS, businesses benefit from technical resources on virtual machines that can be shut down, stopped, reinstalled, or configured. PaaS (Platform as a Service) allows you to rent the use of servers and integrated tools. This configuration is extremely useful for being able to quickly have access to a development and testing environment but also to host a website without having to manage the system layers. SaaS (Software as a Service) is the Cloud service that's most well known by the general public. It enables businesses to use, in the form of a software package, multiple applications available online, generally by subscription. Apps like Google and Office 365 are examples of SaaS. The provider handles the installation, configuration, operations, and maintenance of the environment.