Diary of a Wimpy Kid is a bestselling illustrated children's book series by Jeff Kinney, following middle-schooler Greg Heffley through humorous adventures in school and family life. The series, created by Jeff Kinney, began as an online diary in 2004 and was later published in print in 2007, quickly gaining popularity for its relatable humor and cartoon illustrations. The books follow Greg Heffley, a middle-school student navigating friendships, family dynamics, and the challenges of adolescence, often illustrated in his "journal" format. The series is known for its mix of text and cartoons, making it accessible and engaging for young readers..