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 a logical entity that represents a file or device, that can accept input or output. All input and output functions in standard C, operate on data streams. Streams can be divided into text, streams and binary streams.