Esotericism refers to a broad range of spiritual, philosophical, and mystical traditions that emphasize hidden knowledge and inner understanding. It often involves teachings that are not accessible to the general public and may require initiation or special insight to comprehend fully. This can include practices and beliefs found in alchemy, mysticism, and various occult traditions. Many esoteric systems explore the nature of reality, the self, and the universe, often seeking to uncover deeper truths beyond ordinary perception. Notable figures in esotericism include Hermes Trismegistus and Gnostics, who contributed to the development of these ideas throughout history.