What is the Difference Between Similar But Different Things, Terms, and Objects

What is the Difference between Bikram Power Iyengar Ashtanga and Hatha Yoga

Yoga is a popular form of exercise, which is practiced to attain perfect physical, mental and spiritual balance. It has its roots in Hinduism, Buddhism and Jainism. With the passage of time, people made many changes and different styles of yoga were evolved.