Anne Frank's Diary is a personal journal written by a Jewish girl named Anne Frank during World War II. She began writing it in 1942 while hiding from the Nazis in Amsterdam. The diary captures her thoughts, feelings, and experiences as she navigates the challenges of living in hiding with her family and others. The diary was discovered after the war and published in 1947 as The Diary of a Young Girl. It has since become one of the most important works of literature, providing insight into the life of Jews during the Holocaust and the impact of war on young people.