What is Raja Y O G A ?
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A Thread.

People Often mistake yoga as performing some complex poses for a period of time.

Sure that is yoga too, but it's not yoga as a whole.

There are 8 limbs of yoga namely
:-
1. Yama
2. Niyama
3. Asana
4. Pratyahara
5. Pranayam
6. Dharana
7. Dhyana
8. Samadhi.

1) Yama :- deals with one's ethical standards and sense of integrity, focusing on our behavior and how we conduct ourselves in life.

The five yamas are:

Ahimsa: nonviolence

Satya: truthfulness

Asteya: nonstealing

Brahmacharya: celibacy

Aparigraha: noncovetousness

2) Niyama :- has to do with self-discipline and spiritual observances. 

The five niyamas are:

Saucha: cleanliness

Samtosa: contentment

Tapas: heat; spiritual austerities

Svadhyaya: study of the sacred scriptures and of one's self

Isvara pranidhana: surrender to God

3) Asana :-  the postures practiced in yoga, comprise the third limb. In the yogic view, the body is a temple of spirit, the care of which is an important stage of our spiritual growth.

4) Pranayam :- Generally translated as breath control, this fourth stage consists of techniques designed to gain mastery over our breathe.
And mastering our breathe gives us conscious control over life currents(prana)

5) Pratyahara :- means withdrawal or sensory transcendence. It is during this stage that we make the conscious effort to draw our awareness away from the external world and outside stimuli.

6) Dharana :- it means concentration: holding the mind on a specific thought or object.

7) Dhyana :- by pratyahara, interiorizing or owning his own mind, the devotees concentrates on a single point and achieve dharana. When by dharana is achieved,

Then he concentrates upon God.

So in other words we can say that dhyana(meditation) is an application of dharana .

8) samadhi :- in the state of samadhi the devotee no longer meditates upon the manifestations of god, but becomes one with Him. He's in a state of ecstacy of superconsciousness.