Platform as a Service (PaaS) provides a runtime environment. It allows programmers to easily create, test, run, and deploy web applications. You can purchase these applications from a cloud service provider on a pay-as-per use basis and access them using the Internet connection. In PaaS, back end scalability is managed by the cloud service provider, so end- users do not need to worry about managing the infrastructure.
PaaS includes infrastructure (servers, storage, and networking) and platform (middleware, development tools, database management systems, business intelligence, and more) to support the web application life cycle.
1) Simplified Development
PaaS allows developers to focus on development and innovation without worrying about infrastructure management.
2) Lower risk
No need for up-front investment in hardware and software. Developers only need a PC and an internet connection to start building applications.
3) Prebuilt business functionality
Some PaaS vendors also provide already defined business functionality so that users can avoid building everything from very scratch and hence can directly start the projects only.
4) Instant community
PaaS vendors frequently provide online communities where the developer can get the ideas to share experiences and seek advice from others.
Applications deployed can scale from one to thousands of users without any changes to the applications.