A USB desk fan is a type of small fan that is powered by a USB port, making it convenient for use with a laptop, desktop computer, or any other device with a USB port. These fans are designed to sit on a desk or other flat surface and provide a gentle breeze to cool you down. They typically have a compact design and can be adjusted to direct airflow in a specific direction. Some models also offer adjustable speed settings, so you can control the intensity of the airflow. USB desk fans are an ideal solution for people who work at a desk for long periods of time or need to cool down in a warm environment, as they are easy to set up and use, and do not require a separate power source.