Are used in input, processing, and output operations that can create more efficient programs as the data can be processed many times without having to be input again.

Functional requirements are used in input, processing, and output operations that can help create more efficient programs as the data can be processed many times without having to be input again.
The functional requirements define function/s of a system or its component. It describes what a software system should do.

Create an interactive presentation of ms powerpoint or any other presentation software in which define the product's characteristics, benefits, why people consider it, etc.