Can you use a PS4 controller on a PS5? Yes, here's how

To use your PS4 controller on a PS5, connect it to the PS5 with a USB cable and press the PlayStation button on the controller.

How To Make A PS4 Or PS5 Controller Work With PC Games

Learn how to connect your PS4 or PS5 controller to your PC, to determine which games it works with, and to make it work with ...

How to upgrade your PS4 games to play on a PS5 with better graphics and frame rates

You can upgrade eligible PS4 games to play on a PS5 in higher quality through the PlayStation Game Hub and PS Store.