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There are many books on Yoga as it has become a fascinating subject of study for many scholars of Yoga. It is an interesting field of study for many scholars. There are many types of Yoga, however, in this thesis only Hatha-Yoga and Raja-Yoga will be considered in detail, Hatha-Yoga and Raja-Yoga will always remain interested in their attempts to give certain physical and mental characteristics to the physical body by certain types of physical exercises and to the mental structure by different types of mental exercises. These physical and mental exercises will develop the process of concentration of mind, the object of which when properly focused, will lead to the attainment of Self-Realization.