Anne's diary, known as "The Diary of a Young Girl," is a personal account written by Anne Frank, a Jewish girl hiding from the Nazis during World War II. She began writing in 1942, documenting her thoughts, experiences, and the challenges faced while living in a secret annex in Amsterdam. The diary provides a poignant insight into the life of a young girl during a time of great turmoil. It captures her hopes, fears, and dreams, making it a significant historical document that highlights the impact of the Holocaust on individuals and families.