IaaS provides virtualized computing resources over the internet. This includes virtual machines, storage, and networking. You can rent these resources on a pay-as-you-go basis, allowing you to scale infrastructure up or down as needed without investing in physical hardware.

PaaS provides a platform allowing customers to develop, run, and manage applications without the complexity of building and maintaining the underlying infrastructure. This includes operating systems, middleware, development frameworks, and other tools.

SaaS delivers software applications over the internet on a subscription basis. These applications are hosted and maintained by the service provider, and users access them via a web browser, eliminating the need for installing and running the software on individual computers.

Groupware, also known as collaborative software, is a type of application software designed to help people involved in a common task achieve their goals. It plays a crucial role in enhancing teamwork and streamlining collaboration in various organizational contexts.