The niyamas are the second limb of classical yoga, five personal disciplines: śauca, purity; santoṣa, contentment; tapas, austerity; svādhyāya, study and recitation; and īśvara-praṇidhāna, dedication to the Lord. The last three together form what the Yoga Sūtras call kriyā yoga, the yoga of action.
Niyama
The observances of yoga: purity, contentment, austerity, self-study and devotion to the Lord.