HDRI in Blender: What Are They For and How Do You Use Them?
HDRI images are used to realistically light 3D scenes. Based on a photograph, the lighting effects of a real-world environment are reproduced.
These are tools that allow you to quickly achieve consistent lighting and atmosphere, and are primarily used for realistic renderings. They are applied through the World settings, where you can also adjust the intensity of the effect.
There are online libraries that offer HDRI images, such as: https://polyhaven.com/hdris.
