To use a keyboard shortcut, press down one or more modifier keys while pressing the last key of the shortcut. Command B is boldface the selected text or turn underlining on or off. In a computer, a keyboard shortcut is a sequence or combination of keystrokes on a computer keyboard which invokes commands in the software. Most keyboard shortcuts enable the user to press a single key or a series of keys one after the other.
Other keyboard shortcuts require pressing and holding several keys simultaneously. Keyboard shortcuts may depend on the layout. They are the most common aspects of modern operating systems and associated software applications.