What does the phrase “you can’t prove a negative” actually mean?

Question

What does the phrase “you can’t prove a negative” actually mean?

In: 1149

Answer 1

Imagine I say you owe me ten grand, you deny it. I take you to court.

The court will demand that I prove you owe me the money, because it would be ridiculous to demand you to prove that you don’t owe me.