A USB sound card is a device that connects to a computer or laptop via a USB port to enhance audio capabilities. It allows users to add or improve sound quality, enabling better playback and recording of audio. This is especially useful for devices that lack high-quality built-in sound systems. These sound cards often come with various ports for connecting headphones, microphones, and speakers. They can support multiple audio formats and provide features like surround sound and noise cancellation. Overall, a USB sound card is a simple solution for anyone looking to upgrade their audio experience.