The Razer DeathAdder Windows driver is the software that enables your Windows PC to communicate with the Razer DeathAdder gaming mouse. The driver allows you to customize the mouse's settings, such as its sensitivity (DPI), button functions, lighting effects, and macros, to optimize your gaming experience. This driver is part of the Razer Synapse software suite, which is Razer's cloud-based configuration tool for its gaming peripherals.