Piggie is a character from the popular children's book series created by author Mo Willems. She is a cheerful and friendly pig who loves to have fun and go on adventures with her best friend, Gerald, an elephant. The stories often focus on their friendship and the lessons they learn together. The Elephant & Piggie series is known for its simple text and engaging illustrations, making it accessible for early readers. Each book features humorous situations and relatable themes, encouraging children to explore emotions and social interactions while enjoying the playful antics of Piggie and Gerald.