The keyboard shortcut "Command + C" is commonly used on Apple computers to copy selected text, images, or files to the clipboard. This allows users to duplicate content without removing it from its original location, making it easy to paste elsewhere. Once content is copied using "Command + C," it can be pasted using the "Command + V" shortcut. The clipboard temporarily holds the copied data until new content is copied or the computer is restarted. This functionality is essential for efficient editing and organizing information across various applications on macOS.