A peripheral is an extra connected device that extends what the computer can do.
People often talk about peripherals only as accessories, but many real beginner issues involve them directly.
A peripheral is a device connected to the computer, often for input, output, storage, or another supporting job.
A peripheral is an extra tool you connect to the computer, like a mouse or printer.
A peripheral is a connected device that helps the computer take input, give output, store data, or do a supporting task.
Because peripherals often feel optional, people sometimes forget they are still part of the full system story when troubleshooting.
Study the larger concept after the word itself becomes clear.