Swar is Sanskrut word, meaning sound or note. It is also a continuous flow of air through one nostril. Yog means union, so Swaryog is a science which is realization of cosmic consciousness through control and manipulation of breath.

Swar Yog is science which is a complete study, observations, control and manipulation of breath or Swar. Pranayam is only related to control of breath in various ways. In Swar Yog, you will find association of breath in relation to activities of sun, moon, various seasons, physical and mental conditions of individuals etc. So Swaryog is more comprehensive in theory and practices related to breath.