UnityCACAO-HDRP17/com.unity.render-pipelines.high-definition/Documentation~/Post-Processing-Main.md

Post-processing in the High Definition Render Pipeline

The High Definition Render Pipeline (HDRP) includes its own purpose-built implementation for post-processing. This is built into HDRP, so you don't need to install any other package.

Post-processing effects in HDRP use the Volume framework. You add post-processing effects to your Camera in the same way you add any other Volume Override.

Note: Some post-processing effects are enabled by default in the HDRP Graphics settings

The images below display a Scene with and without HDRP post-processing.

Without post-processing.

With post-processing.