"Cmd + C" is a keyboard shortcut used on Mac computers to copy selected text, images, or files to the clipboard. This allows users to duplicate content without removing it from its original location. The copied item can then be pasted elsewhere using the "Cmd + V" shortcut. This command is part of a set of common shortcuts that enhance productivity and efficiency while working on a computer. Similar shortcuts exist for other operating systems, such as "Ctrl + C" on Windows, providing users with a consistent way to manage their data across different platforms.