"Chariots of the Gods" is a book and idea created by a man named Erich von Daniken. He thought that many things in ancient history were too complicated and too advanced for people at that time to have created on their own. He believed that instead, ancient people were helped by aliens from outer space.
The book suggests that ancient people built amazing things, like pyramids and statues, with the help of these alien beings. The aliens supposedly used their advanced technology to teach people how to do things like build giant structures, use electricity, and make advanced machines.
Some people think this idea is really cool and interesting, but most scientists and historians don't think it's very likely. They have studied these ancient structures and think that humans are capable of amazing things when they work together and use their creativity and intelligence. They don't see any evidence that aliens were involved.
So basically, the "Chariots of the Gods" idea is a fun story that some people believe, but most experts don't think it's true.