Okay kiddo, so nehebkau is a creature that was believed to exist in ancient Egyptian mythology. Some people thought that it was a serpent or a snake, but others believed that it was more like a magical force or power that protected people from bad things happening to them.
The name nehebkau is made up of two words: "neheb," which means "to protect," and "kau," which means "soul." So basically, people believed that the nehebkau was a creature or force that protected people's souls from harm.
It was also associated with the god Ra, who was the sun god. People believed that the nehebkau would help Ra travel safely during his journey across the sky every day.
So in short, nehebkau was a thing that was thought to protect people's souls from harm and help the sun god Ra do his job. Pretty cool, huh?