Anne Frank's family went into hiding in July 1942 to escape the Holocaust during World War II. The Nazi occupation of the Netherlands posed a constant threat, prompting the Franks to seek refuge in the secret annex of her father's office building. The family's decision was influenced by the persecution of Jews in Europe, making this hiding necessary for survival. They remained there for over two years, during which Anne documented her experiences in her famous diary. Tragically, they were discovered in August 1944, leading to Anne's deportation and eventual death in a concentration camp.