HDRI images are used to provide realistic and dynamic lighting and environmental effects in your scenes. These images are often spherical or cylindrical panoramic photographs that capture the lighting information from a real-world location.
HDRI images enable you to simulate different times of day and weather conditions by changing the HDRI image used in the scene. For example, you can switch between a clear blue sky during the day and a moody, overcast sky at sunset, all by swapping out the HDRI image.