The Registered Yoga Teacher designation is an enhanced credential, issued by independent third party registrars like the British Wheel of Yoga and The Yoga Alliance. It is not currently required in the U.S., Canada or the majority of countries internationally, but may be required within some countries. You should check on your country’s regulations, if any, pertaining to the licensing for Yoga instructors. Yoga is largely unregulated in many countries.
Yoga certification alone will open employment doors, and enable you to obtain teacher insurance.