A Wireless 11g MiniUSB 2.0 Adapter is a small device that allows you to connect your computer or laptop to a wireless network via a USB port. The "11g" refers to the Wi-Fi standard (802.11g), which supports speeds up to 54 Mbps. This adapter would typically be used in older systems or devices that don't have built-in wireless capabilities, or to upgrade existing wireless features. To use it on a Windows system, you'll need to install the appropriate driver, which enables the operating system to recognize the adapter and establish a network connection.