A USB modem is a device that allows a computer or other compatible device to connect to the internet or a network using a USB port. Typically, USB modems use telephone lines, cellular networks, or broadband connections to provide internet access. They are often used as portable solutions for internet connectivity, especially in areas without built-in network interfaces or Wi-Fi. USB modems can be plug-and-play, making them easy to use and install. In cybersecurity, these devices can pose risks if not properly secured, as they may introduce vulnerabilities or be used to bypass network controls, making monitoring and securing endpoints with USB modems important.