Yoga of Postures is branch of Yoga popularly known as Hatha Yoga. It is the most popular branch of Yoga in the West.
It is a branch of Yoga that uses physical poses or Asana, Breathing Techniques or Pranayama, and Meditation to achieve better health, as well as spirituality. There are many styles within this path - Iyengar, Integral, Astanga, Kripalu, and Jiva Mukti to name a few.