Which device is considered a peripheral?

A peripheral device is any external device that connects to a computer to add functionality or provide input and output capabilities. The mouse is a prime example of a peripheral because it is not a core component of the computer but rather an accessory that enhances the computer's ability to interact with the user.

Peripheral devices are typically classified into input devices, output devices, or storage devices. The mouse falls under the category of input devices, as it allows the user to interact with the computer by controlling the pointer on the screen.

In contrast, the motherboard, CPU, and RAM are considered core components of a computer system. They are essential for the operation of the computer itself, as they handle data processing, storage, and communication within the system. Therefore, while they are crucial for the computer's functionality, they do not fit the definition of peripheral devices.