PaaS - Platform-as-a-Service
PaaS (platform-as-a-service) is the layer above IaaS (infrastructure-as-a-service), comprising of platforms such as databases & web servers. PaaS is especially popular for developers and development businesses, as they can concentrate on developing their apps and core business, while the management of the platform is left to a service provider.
Advantages of PaaS include reduced coding time, easier development for multiple devices, easier geographic distributed development, and efficient management of the application life cycle.