With Platform as a Service(PaaS), a distinction is made between an open platform as a service, the Public Platform as a Service, and the Private Platform as a Service designed for sensitive information and applications.
With public PaaS, the complete infrastructure with servers and storage is provided to the customer as Infrastructure as a Service( IaaS) by an IaaS provider, including maintenance and service. The user can concentrate on his app development work and uses the offering of a public PaaS provider, which works with predefined schemas. These can refer to programming languages and their syntax. Google usually works with Python. Alternatively, Hypertext Preprocessor( PHP), Java or Ruby can also be used.