Raja Yoga

Raja Yoga involves psycho-physical meditational techniques which attain experiences of the truth and finally achieve liberation. Raja yoga is also known as Ashtanga Yoga. The term Ashtanga means eight limbs, thus Ashtanga Yoga refers to the eight limbs of yoga.
The eight limbs of Raja Yoga are:

Yama: Code of conduct - self-restraint
Niyama - religious observances
Asana - integration of mind and body through physical activity
Pranayama - regulation of breath leading to integration of mind and body
Pratyahara - abstraction of the senses
Dharana - concentration, one-pointedness of mind
Dhyana - meditation (quiet activity that leads to samadhi)
samadhi - the quiet state of blissful awareness, superconscious state