Caillou is a children's series based on the French books by Christine l'Heureux.

The series is about a little four-year-old boy named Caillou, which translates as "baldy" because Caillou himself has no hair. The little boy playfully experiences everyday things and discovers the world with fascination. His parents are portrayed as exemplary parents, as they are both very good at dealing with children, but also have a suitable answer ready for each of Caillou's questions. The dialogues are kept simple so that they are easy for young children to understand, and feelings such as sadness, fear and anger are conveyed using words that young children understand.