CFOP is a method (more optimized version of LBL(Layer by Layer))
PLL is an algorithm set used to Permute the Last Layer (which can be split into 2 steps or looks). I'm not familiar with CFOP so I don't know if 4 look PLL is a thing.
I use the Roux method and I highly recommend trying out other methods! It's harder to learn them once you're set in your ways :P
@miria
Yes. CFOP PLL can be done in 4 steps when you're a beginner (call 4-look) with few algos. Then you can learn more algos and do it in 3 steps.
Finally, you can learn all algos and do it in 2 steps also called 'full PLL'.