Prana (प्राण, prāṇa) is the Sanskrit word for “life force”. In yoga, Oriental medicine, and martial arts, the term refers to a cosmic energy believed to come from the sun and connecting the elements of the universe. The universal principle of energy or force, prana is the sum total of all energy that is manifest in the universe.
Prana is a Sanskrit word constructed of the syllables prā (to fill, the cognate to Latin: plenus (full)) and “an”. An means movement and pra is a prefix meaning constant. Therefore, prana means constant motion, or the primary and all round motion of Life Energy. This constant motion commences in the human being as soon as he is conceived in his mother’s womb. Prana is therefore a type of energy responsible for the body’s life, heat and maintenance. This life energy, prana (प्राण) has been vividly invoked and described in Vedas. In Ayurveda, tantra and Tibetan medicine “pranā vāyu” is the basic vāyu (wind, air) from which all the other vāyus arise.