I heard the word 'mounting' of devices in Linux? what is its actual meaning? How it handling now unlike older versions?

I haven't done that manually by commandline.

  Can you give the steps(commands) for mounting a simple device in Linux?

__Kanu

I've heard the term "mounting" when referring to devices in Linux. What is its actual meaning? How it handling now unlike older versions?

I haven't done that manually via the command-line. Can you give the steps  (commands) for mounting a simple device in Linux?