Why do people have shadows? I know it's a weird question,but I've been thinking about it for a long time and I never seemed to get the answer,so if you guys have an idea,that'd be great

I think it's because our bodies are blocking the light behind us and so we have a shadow. Another theory of mine is that they're a sign of our soul, just like in Undertale where a red heart a sign of the protagonist's soul.

IT IS A GLITCH IN THE COMPUTER THAT CREATED REALITY BECAUSE THIS REALITY ISN'T ACTUAL REALITY, BUY GOLD, BYE