1-Karma yoga (the path of work)
2-Bhakti yoga (the path of worship)
3-Jnana yoga (the path of philosophy)
4-Raja yoga (Astanga yoga)

There are large numbers of method of yoga, catering to the needs of the different person in society to bring about the transformation of the individual they are broadly classified into four streams. Swami Vivakanand put them as work and worship, philosophy and psychic control.
 

KARMA YOGA
 The path of work (karma yoga) involves doing action with an attitude of detachment to fruits of action. This makes man release himself from the strong attachments and thereby brings in him a steadiness of mind which verily is yoga – samatvam yoga  uchyate .
Instruments of action and understanding (Karmendriyas and Jnanendriyas) get cleansed.

BHAKTI YOGA
The term Bhakthi comes from the root ‘bhaj’ which means to be attached to ‘God’
 The control of emotion is the key in the path of worship (Bhakti yoga). In this modern world, man is tossed up and down due to emotional onslaughts. The path of Bhakti is a boon to gain control over emotional instabilities by properly harnessing the energy involve in it.

JNANA YOGA
The age of science has made man a rational being. Intellectual sharpness is immanent. Analysis forms the tool. The path of philosophy (jnana yoga) is apt for the keen intellectuals and is centered around the analysis of ‘happiness’. Also many other fundamental question regarding the mind, the outside and inside world and the reality are taken up. Basic questions are raised even involving the intellect itself to reach the very basis of intellect.

RAJA YOGA
Culturing of mind is the key for success in almost all endeavors in our lives. The yoga of mind culture or psychic control (Raja yoga) gives a practical and easy approach to reach higher stare of consciousness. It is based on the astang yoga of Patanjali’s yoga system.

Thus four streams of yoga help man to develop the personality at four different levels- physical, mental, intellectual, and emotional and simultaneously bring about spiritual progress. Most of the other methods of yoga –Laya Yoga, Japa Yoga, Mantra Yoga, Hath Yoga, Kundalini Yoga, etc.., are permutations and combinations of these basic methods of yoga