Functional and nonfunctional requirements documents are used to: define the purpose of a system

define the financial budget of a system

facilitate communication between the users and a system

help exercise control over the inner workings of the firm

In 1973 was when graphical user interfaces (guis) pioneered.

I’d say platform as a service (paas) or application platform as a service (apaas) or platform base service is a category of cloud computing services that provides a platform allowing customers to develop, run, and manage applications without the complexity of building and maintaining the infrastructure typically associated with developing and launching an app.