"Diary of a Wimpy Kid" is a popular children's book series written by Jeff Kinney. The story follows the life of Greg Heffley, a middle school student who navigates the challenges of growing up, friendships, and family dynamics. The books are presented in a diary format, featuring handwritten text and cartoon illustrations that appeal to young readers. The series began with its first book published in 2007 and has since expanded to include numerous sequels and spin-offs. Greg's humorous and relatable experiences resonate with kids, making the series a favorite for both reluctant and avid readers.