What difference between cmp and diff commands?

Question

In my knowledge, both commands are used to get the details of Linux system. But I want to know the difference between these two and when to use which one ?

Answer 1

cmp

-Byte by byte comparision performed for two files comparision and displays the first mismatch byte.
-cmp returns the 1st byte and the line no of the fileone to make the changes to make the fileone identical to filetwo.
-Directory names can not be used.

diff

-Indicates the changes that are to be done to make the files identical.
-returns the text of filetwo that is different from filetwo.
-Directory names can be used