It holds copied Items temporarily before being placed/pasted in a new location or within the same place in a document.
from the Windows clipboard
To reset the clipboard count on Windows, you can clear the clipboard history by pressing Windows + V, then selecting "Clear All" from the menu. This will reset the clipboard and remove any items stored in its history. If you want it to display again, ensure clipboard history is enabled by going to Settings > System > Clipboard and toggling on "Clipboard history." After this, it will automatically show the clipboard when you use the shortcut.
I take it that you are referring to the "Clipboard Viewer" application, which has been removed from Windows Vista for unknown reasons. You can, however, copy the Clipboard Viewer from a Windows XP computer to your Vista computer: Look for the file C:\windows\system32\clipbrd.exe on your windows XP computer. Copy that to your Vista computer and paste the file wherever you need it. Double-clicking on the icon will enable you to open the Clipboard Viewer.
The Windows 8 clipboard can only hold one piece of information at a time. The Office clipboard however can hold up to 24 items at a time.
clipboard
When you shut down Windows, the information stored in the clipboard is typically lost, as the clipboard data is held in volatile memory (RAM). This means that once the system powers down, the contents of the clipboard are cleared and cannot be retrieved upon restart. However, if you have clipboard management software, it may save clipboard history persistently, allowing you to access previously copied items after a reboot.
CLIPBOARD
Ctrl + V
clipboard
CLIPBOARD
It is a memory location called the clipboard. Text is pasted to the clipboard to allow you to paste it to another location.
The most common implementation of such a thing is usually called a clipboard.