Kriyā

most commonly refers to a "completed action", technique or practice within a yoga discipline meant to achieve a specific result.

Etymology

is a Sanskrit term, derived from the Sanskrit root, meaning 'to do'. ' means 'action, deed, effort'. The word karma is also derived from the Sanskrit root ' कृ, meaning 'to do, make, perform, accomplish, cause, effect, prepare, undertake'. Karma is related to the verbal Proto-Indo-European root kwer- 'to make, form'.
The root is common in ancient Sanskrit literature, and it is relied upon to explain ideas in Rigveda, other Vedas, Upanishads, Puranas, and the Hindu epics.

The Yoga [Sutras of Patanjali] 2.1 defines three types of, namely tapas, svadhyaya, and [Ishvarapranidhana|].
The yogic purifications or shatkarmas are sometimes called the Shatkriyas.
The Kriya [Yoga (Yoga school)|Kriya Yoga school], established by Yogananda, is centered on pranayama techniques.