The NVIDIA GeForce GTX 1070 Windows driver is software that allows the operating system to communicate with the NVIDIA GeForce GTX 1070 graphics card in your computer. This driver ensures that the GPU functions properly and provides access to its full capabilities, such as rendering graphics in games, applications, and even for tasks like video editing or AI computation. Without the correct driver, the GPU may not function correctly or may not be fully utilized by the system.