• Aasana means a sitting position of the body, which contributes to the steadiness of the body and mind and a sense of well-being.

• Aasanas occupy the first place in Hatha yoga while they form the third part of ashtanga yoga.

• Aasanas are often translated as postures viz., Bhujangasana is called cobra posture, Makarasana as crocodile posture, Dhanurasana as bow posture and so on.

It is true that aasanas are the modified part of the three basic human postures i.e. standing, sitting or lying postures, but they differ in many respects. The term posture does not convey fully the meaning of aasana.
 
Aasana is defined as a comfortable posture for prolonged sitting. 
Aasanas have multidimensional roles to play in the practice of yoga and welfare of the mankind namely:

• Relaxation,
• Meditation, 
• Cultural - the means of relieving the disease.