A key in the Windows Registry
can be thought of like a file folder. A key that sits within another key is called a "subkey."
Registry keys may contain additional registry subkeys and registry values and will always exist under the highest key in the hierarchy called a registry hive.
In Registry Editor, keys and subkeys are shown as the folders on the left hand of the screen.
Also Known As: registry subkey, registry entry
Examples: "The key I was working with in the Windows Registry had numerous subkeys and values pertaining to several Internet Explorer functions."