Bertie is a popular character from the children's book series created by A.A. Milne, known for his adventures in the Hundred Acre Wood. He is often depicted as a friendly and curious bear who enjoys spending time with his friends, including Winnie-the-Pooh and Piglet. In the stories, Bertie embodies themes of friendship, kindness, and exploration. His character is beloved for his playful nature and the lessons he learns throughout his adventures, making him a favorite among young readers and their families.