if you could please respond in a 4-7 sentence paragraph
What is the difference between a real-time light and a shadow map? Which of the two would you use if you need to conserve CPU power?
Real-Time lightning is that all lights and shadows are being calculated at runtime, which is a lot of process power.
Shadow map, or baked lightning, is that you calculate shadow and lightning for static objects before runtime, and use that information to render shadows and lights at runtime, conserving much needed process power for something else, like physics.
For more information, please start here: Introduction to Lighting and Rendering - Unity Learn