Judy Moody is a popular children's book series written by Megan McDonald. The series follows the adventures of a third-grade girl named Judy Moody, who is known for her strong personality and unique mood swings. Each book explores Judy's experiences at school, with friends, and at home, often highlighting her creativity and determination. The first book, titled "Judy Moody," introduces readers to her quirky character and her various moods. The series is aimed at early readers and is celebrated for its humor and relatable themes, making it a favorite among children and parents alike.