What is the difference between Yoga & Pilates?

There's no real "Yoga versus Pilates" debate - each one has a different focus and approach. 

Neither discipline is new - Yoga originated in India and has been around for thousands of years. It was brought to the Western world more than a hundred years ago and popularized in the middle of the twentieth century. It has increased in popularity since the 1960s counter-culture movement and today it is a mainstream form of fitness.