Wait, is there a non-URP post processing stack??
There is an old post-processing stack (which is usually called post processing stack v2) that was made before URP and HDRP were released. This stack provides a little bit less features than HDRP stack, but it provides some very important features that URP stack doesn’t have (because URP is made for low-end devices). But URP and HDRP stacks have more color correction features. I prefer built-in stack because its quality is pretty much similar to HDRP stack, but its easy to use. More info here: https://docs.unity3d.com/Packages/com.unity.render-pipelines.high-definition@7.1/manual/Feature-Comparison.html https://docs.unity3d.com/Packages/com.unity.render-pipelines.universal@7.1/manual/universalrp-builtin-feature-comparison.html