Okay kiddo, let me explain what Aztec codices are. They are like big books made by the Aztec people a very long time ago. In these books, they wrote and drew pictures about their history, stories, and beliefs.
The Aztecs used to live in Mexico and they had a really cool way of writing. Instead of using letters like we do, they used symbols and drawings to represent things. They would draw pictures of animals, people, and objects to tell the story.
The codices were very important to the Aztecs because they helped them remember their history and pass it down to future generations. They wrote about their gods, their kings, and important events in their history.
Today, these codices are like treasure because they are so old and rare. They help us learn more about the Aztec people and their way of life. Some of the codices have been preserved and are now in museums for people like us to see and learn from.