Characteristics of input and output information flows of the program?

Question

Programming

What does "Characteristics of input and output information flows of the program" mean? And are there any resources you can check out?

Answer 1

Examples:
-------------------------
Input streams:
Typed data (form fields)
Data stream (socket)
, etc.
Output:
Formation of a report in PDF format with saving to a file
Message to an information display device (for example, a monitor)
, etc.

Answer 2

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