The Eight Limbs Of Astanga Yoga

Yama
Yama is the first limb of Ashtanga Yoga and comprises of the behavioral norms that need to be followed, to attain tranquility of the mind. It mainly comprises of directives such as Ahimsa (non-violence), Satya (truthfulness), Asteya (non-stealing), Brahmacharya (celibacy) and Aparigraha (non-covetousness). These are essential for eradicating the element of fear and anger from the body. 

Niyama
Niyama controls the emotional aspect of a person, with the help of mental
exercises to train the mind. Its directives involve Shaucha (internal and external purity), Santosha (contentment), Tapas (austerity), Svadhyaya (study of religious books and repetitions of Mantras) and Ishvarapranidhana (self-surrender to God, and His worship). 

Asana
Asan or posture is a means to attain integration of mind and body, by means of physical activity. Contrary to the popular belief, asanas are not exercise, but activities which help to transmit the positive energies to the crown chakra. Apart from providing numerous physical health benefits, the various asanas aim to bring unison of the mind and the body with the spirit. 

Pranayama
Just as the name suggests, (prana, which means life energy and yama, which signifies control), pranayama is a way by which one can attain life force energy control, through breathing. The main goal of pranayama heads towards the awakening of the kundalini shakti at the muladhara chakra. It is through breathing regulation that one can attain control over the life energies. 

Pratyahara
Once the above four limbs have been achieved, Pratyahara aims to attain the withdrawal of the senses of perception from their objects. It should not be linked to be the same as that of concentration or meditation. Instead, it aims to bring the awareness to reside deep within oneself, free from the senses and external world. 

Dharana
Dharana focuses on concentration and one-pointedness of the mind. For attaining an ideal concentration level, you need to follow the factors such as retention of breath, Brahmacharya, Satvic (pure) food, seclusion, silence, Satsanga (being in the company of a guru), and not mixing much with people. Concentration on Trikuti (the space between the two eyebrows) would help to control the mind. 

Dhyana
Dhyana focuses on the importance of meditation. The basic of this limb is to involve oneself in quiet activity that will help you leads to Samadhi. Social exclusion, less talk, no demands, no violence and limited eating and sleeping all contribute to Dhyana. 

Samadhi
 Samadhi can be described as enlightenment. To attain Samadhi, you need to remove obstacles which come as Avidya (ignorance), Asmita (egoism), Raga-Dvesha (likes and dislikes), Abhinivesha (clinging to mundane life)