Question: what is the difference between raja and hatha yoga?
Answer: Like the previous answer states, Hatha Yoga deals with the body. It involves Asanas, Pranayama, Mudras, Bandhas, Kriyas etc. Raja Yoga works in more subtle levels. It involves Pranayama, the movement of prana up and down the spine, the chakras, Kundalini, also the tenets of self-control etc.