The PS5 controller doesn't just work with the PS4, so you must pick up a Bluetooth adapter. This will usually come in the form of a USB device which needs to be plugged into the PS4. The adapter then ...
PS4 owners, especially in the era of the PS5, we all know your struggle. But with how the new Sony console's been out of stock basically anywhere for over half a year now, it's old news at this point.