Elephant and Piggie is a popular children's book series created by author Mo Willems. The series features two main characters: Gerald, the cautious elephant, and Piggie, the cheerful and adventurous pig. Each story explores themes of friendship, emotions, and problem-solving through simple, engaging narratives and expressive illustrations. The books are designed for early readers, using a limited vocabulary and repetitive phrases to encourage reading confidence. The playful dialogue between Gerald and Piggie captures the ups and downs of their friendship, making the stories relatable and enjoyable for young audiences.