Tethering is a process of connecting one device, such as a smartphone or tablet, to another device, usually a computer, in order to share the internet connection. This allows the second device to access the internet using the data connection of the first device. Tethering can be done via a USB cable, Bluetooth, or Wi-Fi. It is commonly used when a secure and stable internet connection is needed in a location where Wi-Fi may not be available. Tethering is a convenient way to stay connected on the go and can be a lifesaver in emergency situations when internet access is crucial.