Cloud Computing is not a single technology such as a cellphone or a microphone. Well, it's a system that is primarily comprised of 3 services: SaaS (software-as-a-service), IaaS (infrastructure-as-a-service) and PaaS (platform-as-a-service).
SaaS (software-as-a-service) is a process for delivering on-demand software applications on a subscription basis. It helps you to manage and host the software application while managing the underlying infrastructure, security patching and software patching.
This is one of the most preferred categories of cloud computing that helps you to rent IT infrastructure from a cloud provider.
PaaS (Platform as a service):
PaaS refers to the delivery of an on-demand environment for creating, testing, delivering as well as managing software applications. With PaaS, it is easy to create web and mobile applications without any hassle of setting up or managing the underlying infrastructure of servers, networks, storage and databases needed for developing software applications.