In IaaS, cloud providers offer virtualized computing resources over the internet. Users can rent virtual machines, storage, and networking infrastructure on a pay-as-you-go basis.
PaaS delivers a platform that includes both hardware and software tools, allowing developers to build, deploy, and manage applications without dealing with the complexities of infrastructure.
SaaS delivers software applications over the internet on a subscription basis. Users can access the software through a web browser without needing to install or maintain it locally.
Public cloud services are provided by third-party vendors and are hosted and operated off-site, allowing users to access computing resources over the internet.
Private clouds are dedicated to a single organization. They can be hosted on premises or by a third-party provider.