The Elephant and Piggie books are a beloved series of children's books written and illustrated by Award winning writer, animator, and picture book creator Mo Willems. The series features two main characters, Elephant (Gerald) and Piggie (Piggie), who are best friends. Each book typically follows a simple and humorous storyline that revolves around their interactions and adventures. They are known for their simple yet profound messages about friendship, empathy, and the ups and downs of life. The series has been widely praised for its engaging storytelling, expressive illustrations, and ability to resonate with both children and adults alike.