Raja Yoga is also known as Ashtanga Yoga (Eight Steps of Yoga), because it is organised in eight parts:
Yama - Self-control
Niyama- Discipline
Asana - Physical exercises
Pranayama - Breath exercises
Pratyahara - Withdrawal of the senses from external objects
Dharana - Concentration
Dhyana - Meditation
Samadhi - Complete Realisation
The eight steps of Raja Yoga provide systematic instruction to attain inner peace, clarity, self-control and Realisation.