Alright kiddo, so way back in ancient times, there were some really fancy people called pharaohs who ruled over Egypt. They were like kings or queens and people really looked up to them.
But as time went on, some people started to believe that the pharaohs had some kind of magical powers. They thought that if they disturbed the pharaoh's tomb or burial place, they would encounter some kind of curse. Now, a curse is like a spell or some kind of bad luck that gets put on someone.
So, people were scared to disturb the pharaohs' tombs because they thought they might get cursed. But despite that, some brave or foolish people still went inside the tombs and took things like treasure or valuable artifacts.
And when bad things happened like accidents or illnesses, some people blamed it on the curse of the pharaohs. It became a superstition that lasted for a long time.
Now, we know that the curse of the pharaohs wasn't actually real. It was just a belief that people had. But it was a really powerful belief that lasted for a very long time!