Yoga has been popular worldwide, yet several people have fuzzy idea about. The   present article attempts to investigate and delineate real nature of Yoga based on holistic  approach–etymological meanings, definition in Indian thoughts, meaning of Yoga as   told by the Yoga scholars, etc. Initially it deals with etymological meaning of Yoga and  related with several Yoga have been defined in       three   sources of Yoga, i.e. Samkhya-Yoga  philosophy, Vedanta Philosophy and the Tantric Philosophy. Simultaneously, it also  attempts to make understanding of Yoga simple and convenient by depicting Yoga as an  End or Ultimate State or Mean or Tool, Process, subject of art and science etc.