Answer Description

A Platform as a Service (PaaS) is a cloud model that focuses on simplifying software delivery. A PaaS will try to automate everything but the software development itself, including the creation of application servers, configuration of those servers, network setup and possibly even creation of additional services like databases or file storage servers. The ultimate goal of a PaaS is to be so simple a developer can upload their code and it will run without the need of specialized IT operations teams to install, configure, monitor, etc. the application.

Wikipedia

Platform as a service (PaaS) or application platform as a service (aPaaS) or platform-based service is a category of cloud computing services that allows customers to provision, instantiate, run, and manage a modular bundle comprising a computing platform and one or more applications, without the complexity of building and maintaining the infrastructure typically associated with developing and launching the application(s), and to allow developers to create, develop, and package such software bundles.