In India adult education has been one of the chief concerns of the Government. Within the field of adult education, there has emerged a process of professionalization, and it has taken the form of a new discipline, ‘andragogy’. This article describes all the necessary details about it. It discusses its etymology, meaning, varieties, sub disciplines and the cycle or the model utilized by its Fractions. The theoretical background is useful for considering its significance in third world where there are large masses of adult illiterates.