Platform as a Service (PaaS) is a cloud computing service that enables developers to build, deploy and manage their applications without the need for managing the underlying infrastructure. PaaS providers offer a complete platform, including a development environment, runtime environment, and data storage, making it easy for developers to focus on building and deploying their applications, rather than worrying about infrastructure and maintenance. PaaS solutions are flexible and scalable, and can be used for a wide range of applications, including web, mobile, and IoT. Popular examples of PaaS providers include Heroku, AWS Elastic Beanstalk, and Google App Engine.