What does 'stream' mean in C?

Question

I\'m reading a section in \'C Primer Plus\' which deals with files, streams and keyboard input. The author connects the concept of stream with files and defines stream as follow

Answer 1

A stream is the C way of dealing with different data mediums/sources. These can include say

1. A file
2. A socket

and so on. A stream, as an interface, helps you forget how data is managed under the hood and concentrate on desired objectives.