Platform as a Service (PaaS) provides a cloud platform and a set of tools to enable the user to develop, run, and manage applications without the complexity of building and maintaining the infrastructure typically associated with the process. PaaS abstracts much of the system administration effort required for setting up environments for development. In contrast, Infrastructure as a Service (IaaS) provides virtualized computing resources over the internet, which still requires the user to manage the infrastructure to some extent. Software as a Service (SaaS) delivers software applications over the internet, which are managed by the service provider and not ideal for custom application development.