Yoga Alliance Registry (YAR) is a USA based non-profit organization which is a public charity that conducts credentialing and developmental activities of Yoga. They are the biggest non-profit organization that supports bringing “Yoga” education and practice to common people and also to maintain standards in the field of “Yoga” education. Their credentialing activities include the teacher and school registries. YAR provides certification to Yoga schools all over the world which qualify their requirements and maintains standards set by YAR. Once you get a certification from a RYS (Registered Yoga School) you are worldwide taken as trained Yoga teacher. A RYS provides certification for Teacher’s Training course for 200hrs, 300hrs and 500hrs. Their details can be seen at https://www.yogaalliance.org/About_Yoga_Alliance.