Originally composed in Dutch, Anne’s diary, named ‘Kitty,’ stood apart from others. She considered Kitty her sole confidante, treating the diary as an attentive listener to her daily experiences. Anne documented all her narratives within its pages, commencing entries with ‘Dearest Kitty’ and concluding with ‘Yours, Anne.’ The diary’s highly personal and informal tone reflected the vivacity and uninhibited spirit of a teenager, making it distinct from conventional diaries.