Key mapping is the process of assigning specific functions or commands to individual keys on a keyboard or controller. This allows users to customize their input devices to better suit their preferences or needs, enhancing their overall experience. For example, in video games, players can remap keys to perform actions like jumping or shooting more conveniently. In software applications, key mapping can improve productivity by allowing users to create shortcuts for frequently used commands. Programs like Microsoft Word or Adobe Photoshop often support key mapping, enabling users to streamline their workflow and access tools more efficiently.