Original PS4 (or PS4 Fat)
You’d be hard-pressed to find the original PS4 still available in shops these days. This is because the PS4 Slim was designed as (and now is) a straight replacement. Those original PS4 consoles should have all but disappeared.
Sony replaced the original PlayStation 4 with a smaller and cheaper version that’s been unofficially named “PS4 Slim”.
The PS4 Pro is the newest version of the PlayStation 4 range. It’s a more powerful version of the original PS4, with a faster graphics processor and support for 4K and HDR TVs. It plays all the same games as the original PS4.