A USB CD Drive is an external device that allows users to read and write data on CDs using a USB connection. It is particularly useful for computers that do not have a built-in optical drive, enabling access to music, software, and files stored on CDs. These drives are typically compact and portable, making them easy to carry. They connect to a computer via a USB port, and most modern operating systems automatically recognize the drive, allowing for quick setup and use. This makes them a convenient solution for accessing CDs on various devices.