Is the katana still used?

Could you elaborate on the current state of the katana, a centuries-old Japanese sword renowned for its precision and craftsmanship? Are there still practitioners who wield it in traditional martial arts forms, or has it been largely replaced by modern weaponry? Do museums and collectors still hold a fascination with the katana, preserving its history and legacy? Additionally, have any technological advancements or innovative designs emerged in recent years that have revived or modernized the katana's use and appeal?