A USB light is a small, portable light source that is powered through a USB port. These lights typically have an LED bulb and are used for various purposes, such as providing extra illumination for keyboards, desks, or for portable reading lights. Some common types of USB lights include:

1. USB LED Desk Lights: These are designed to provide extra light for workspaces or desks. They are compact, adjustable, and powered directly from a USB port on a computer, laptop, or power bank.

2. USB Reading Lights: Often flexible and clip-on, these lights are used for reading in low light without disturbing others.

3. USB Night Lights: Some people use small, low-power USB lights as night lights in bedrooms or hallways, often plugged into wall chargers.

4. USB Keyboard Lights: These are small, flexible lights that attach to a keyboard to illuminate the keys.

5. USB RGB Lights: For decoration, these lights can change colors and are often used for creating a vibrant atmosphere in rooms or on computer setups.