Platform as a service (PaaS) is a complete development and deployment environment in the cloud. You purchase the resources you need from a cloud service provider on a pay-as-you-go basis. PaaS is designed to support the complete web application lifecycle: building, testing, deploying, managing, managing and updating. It includes infrastructure, middleware, development tools, business intelligence services, database management systems, and more. It also includes infrastructureservers, storage, and networkingbut also middleware and development tools.”]
Source: https://azure.microsoft.com/en-us/overview/what-is-paas/