USB tethering is a feature that allows a mobile device to share its internet connection with another device, such as a computer or laptop, via a physical USB data cable. When USB tethering is enabled, the mobile device acts as a wireless modem, providing internet access to the connected device. This feature is available on many mobile devices, including those running Windows Mobile 6.5, Windows Phone 7, Android (starting from version 2.2), and iOS 3.0 (or later) .

To enable USB tethering, the mobile device must be connected to the computer or laptop via a USB cable. Once connected, the user can enable USB tethering on their mobile device, which will prompt a pop-up window asking permission to connect to other devices. Once the user clicks "Yes," the computer or laptop will be connected to the mobile device for internet sharing.

Some advantages of USB tethering over mobile hotspot include:

• The computer does not need to have Wi-Fi (Wireless LAN) functionality for USB tethering.
• It does not lower the battery life of the mobile device as much as mobile hotspot.

It is important to note that some mobile carriers limit or charge extra for tethering, and some devices may require additional software or rooting to enable tethering.