A USB cable is a type of cable used to connect electronic devices for data transfer and charging. It typically has a rectangular connector on one end, known as USB Type-A, and a smaller connector on the other end, such as USB Type-B or USB Type-C. These cables are commonly used with devices like smartphones, tablets, and computers. USB cables come in various lengths and types, allowing for flexibility in usage. They support different data transfer speeds, with newer versions like USB 3.0 and USB 3.1 offering faster connections compared to older versions. Additionally, many USB cables can also deliver power, making them essential for charging devices.