Final answer:
The computer keyboard features certain keys like 'Shift', 'Alt', 'Ctrl', and 'Enter/Return' twice for ergonomic reasons and to facilitate ease of use for various actions such as capitalization, keyboard shortcuts, and commands.
Step-by-step explanation:
The keys which come twice on a computer keyboard are the 'Shift', 'Alt', 'Ctrl' (Control), and 'Enter/Return' keys. These keys are duplicated to enhance ergonomics and flexibility, allowing for easier access and use depending on the hand preference of the user or the specific function they are performing. For example, 'Shift' keys are used for typing capital letters or accessing the upper characters on keys, and having them on both sides allows for balanced typing. The 'Ctrl' and 'Alt' keys are used for keyboard shortcuts, while the 'Enter/Return' key is often used for commands such as submitting data or moving to a new line while typing.
Having these keys on both sides of the keyboard helps users to perform tasks efficiently, as they can use whichever key is closer or more convenient, reducing the need to stretch fingers across the keyboard. This design is particularly useful for touch typists or those who use keyboard shortcuts frequently in software applications or video games, where speed and accuracy are essential.
Pressing Ctrl + C will copy selected text or files. The Alt key is often used in combination with other keys to access menu options or perform special functions.
It's important to note that the specific functions of these keys may vary depending on the operating system or software being used. However, modifier keys are a common feature on computer keyboards and can greatly enhance productivity and efficiency.