Raja Yoga is one of the six orthodox schools of Hindu philosophy outlined by the Sage Patanjali in his Yoga sutras. Raja yoga is concerned principally with the cultivation of the mind using meditation (dhyana) to finally attain moksha. Raja Yoga is sometimes called Aṣṭānga (eight-limbed) yoga because there are eight aspects to the path to which one must attend and is referred to as the king among yogas. The eight limbs are yama, niyama, asana, pranayama, pratyahara, dharana, dhyana and samadhi. The first four limbs being parallel to the lower limbs of Hatha Yoga and the rest of the four are more specific to Raja Yoga. The first three limbs practiced simultaneously constitute the Samyama.
There are different variations to the original Raja Yoga and is practised with some modifications by different schools of thoughts. The Brahmakumaris and the Shri Ram Chandra Mission are examples of such schools of thoughts. The Brahma Kumaris World Spiritual University (BKWSU) is an international non-governmental organisation headquartered at Mt. Abu, Rajasthan, India with over 8,500 centres in 100 countries, territories and islands. The Sahaj Marg system is freely offered to seekers worldwide through the Shri Ram Chandra Mission (SRCM) under the guidance of current living Master, Parthasarathi Rajagopalachari (also known as "Chariji").