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'''Diffuse reflection''' is the [[reflection (physics)|reflection]] of [[light]] from an uneven or granular surface such that an incident ray is seemingly reflected at a number of angles. It is the complement to [[specular reflection]]. If a surface is completely nonspecular, the reflected light will be evenly spread over the [[hemisphere]] surrounding the surface (2×[[pi|π]] [[steradian]]s).
The most familiar example of the distinction between specular and diffuse reflection would be [[matte (surface)|matte]] and [[glossy]] [[paint]]s as used in home painting. Matte paints have a higher proportion of diffuse reflection, while gloss paints have a greater part of specular reflection.
'''Diffuse interreflection''' is a process whereby [[light]] reflected from an object strikes other objects in the surrounding area, illuminating them. Diffuse interreflection specifically describes light reflected from objects which are not shiny or [[specular]]. In real life terms what this means is that light is reflected off non-shiny surfaces such as the ground, walls, or fabric, to reach areas not directly in view of a light source. If the diffuse surface is [[color]]ed, the reflected light is also colored, resulting in similar coloration of surrounding objects.
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