Ctrl+X is the standard keyboard shortcut for Cut in Windows applications - it removes the selected content and places it in the clipboard. Ctrl+C is for Copy (duplicates without removing). The X represents scissors/cutting.
Ctrl + X is the standard Windows shortcut for 'Cut', removing the selected content and placing it on the clipboard for pasting elsewhere. Ctrl + C is used for 'Copy' instead, and Alt + C / Alt + V aren't standard cut/paste shortcuts.