Yogas citta vrtti nirodhaha
Yoga is to calm thoughts in the mind.

Literally Yoga means oneness and harmony. Through Yoga one can achieve inner peace and unity with the cosmic awareness, with god

Yoga is an very old system coming from India.
The aim of Yoga is to find inner peace and unity with the cosmic awareness. There are many ways for that, may it be devotion, self-sacrificing service, the knowledge or the energy.
The most common way are the physical postures, known as Hatha Yoga.
Here bodypositions (asanas) and breathing techniques (pranayama) are practised.
Deep relaxation, positive thinking and a healthy diet, are aspects of Hatha Yoga as well.