What is PaaS?
Also known as: Platform as a Service
Platform as a Service (PaaS) is a cloud computing model where the provider manages the underlying infrastructure, middleware, and runtime, allowing customers to deploy and run applications without handling servers or patching.
Platform as a Service (PaaS) is a cloud service category that delivers a managed application-hosting environment. The customer writes or uploads application code, and the provider handles servers, operating systems, storage, networking, and runtime middleware. PaaS sits between Infrastructure as a Service (IaaS) and Software as a Service (SaaS) in the cloud stack.
Under PaaS, the provider automates provisioning, scaling, load balancing, and patching of the underlying platform. Customers interact through a web console, CLI, or API to deploy code, configure databases, and monitor performance. Common PaaS offerings include Google App Engine (introduced 2008), Heroku (2007), and Red Hat OpenShift. These platforms typically support multiple programming languages (Java, Python, Node.js, Go) and integrate with version-control systems for continuous deployment.
PaaS reduces operational overhead for development teams by abstracting infrastructure management. It is well suited for web applications, APIs, and microservices that need rapid iteration and elastic scaling. However, PaaS can impose constraints on the runtime environment, such as limited filesystem access or specific middleware versions, which may complicate migration of legacy applications. Organizations often combine PaaS with IaaS for hybrid deployments or use PaaS as the deployment target in a DevOps pipeline.
Key facts
- PaaS abstracts servers, OS, and middleware; the customer manages only code and data.
- Providers handle patching, scaling, and high availability of the platform layer.
- Common PaaS examples: Heroku, Google App Engine, AWS Elastic Beanstalk, Red Hat OpenShift.
- PaaS typically supports multiple runtimes (Java, Python, Node.js, .NET, Go).
- PaaS is defined in NIST SP 800-145 as one of the three essential cloud service models.
How it works in practice
Related terms
References
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