What is the clipboard?
The clipboard is not a program you can access, it is a block of your computer memory. Anything you copy is stored in a special section of your upper memory called the clipboard.
Any time you Copy (CTRL-C) or Cut (CTRL-X) the contents are sent to the clipboard and they are then available to be Pasted (CTRL-V) into another program.
The clipboard always holds the last item you copied unless you turn off your computer.