When you enable Voice Access, you'll be able to use voice commands to perform all sorts of tasks. You can say things like "Open Chrome" or "Go to Settings" to get where you need to go. It's really convenient, especially if you're someone who likes to multitask or has trouble using your phone with one hand.
One of the things that's really impressive about Voice Access is its ability to learn and adapt to your voice. The more you use it, the better it gets at recognizing your commands and responding accordingly. It's pretty cool, and it makes the whole experience feel really natural and seamless.