Light probes are a way of sampling the environment for light information to create indirect illumination and reflections by baking it beforehand. Since real-time render engines like Eevee can’t afford to realistically calculate indirect light and reflections they must come up with all sorts of tricks to provide a satisfactory instant result, thus light probes were born, another cheat in the book of real-time rendering techniques. In this process, reflections, and indirect light is included. In a ray-traced render engine like Cycles, we shoot rays backwards through the scene, use each material's properties to evaluate how the rays behave and return a color for each pixel.
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