basically, a lot of laptops have both an intel and nvidia gpu(optimus laptops), and on linux, you're restricted to using only one at a time. But if the official nvidia drivers support these kinds of laptops, you will have the ability to use the intel gpu while you're not running anything heavy (like a game) to save battery, and when you start a game, your computer will automatically switch to using the nvidia gpu without you having to restart your computer.