Advaita Vedanta, as interpreted and propagated by Swami Vivekananda, is a philosophy of non-dualism which asserts the essential oneness of the individual soul (Atman) and the ultimate reality (Brahman). According to this doctrine, there is only one absolute existence, which is infinite, eternal, and unchanging. The apparent multiplicity of the world is the result of ignorance (Avidya) and illusion (Maya). Vivekananda presented Advaita not merely as a metaphysical theory but as a practical and dynamic philosophy capable of transforming individual and social life. In Advaita Vedanta, Brahman is the only ultimate reality. It is beyond name, form, and attributes, yet it is the substratum of everything that exists. The individual self, or Atman, is not separate from Brahman; rather, it is identical with it. The famous Mahavakya “Tat Tvam Asi” (Thou art That) expresses this identity. Vivekananda emphasized that every human being is potentially divine, and the goal of life is to manifest this divinity by controlling nature, both external and internal. This realization of one’s true