The fifth limb of Patanjali's Eight Limbs, commonly translated as withdrawal of the senses or turning sensory attention inward.
How the term is used
In practical modern language, it can be explored as the ability to step away from constant external stimulation long enough to notice internal experience.
Why it matters
It creates a bridge between breath practice and the more inward limbs of concentration and meditation.
Read the guide Yoga Beyond the Poses: A Guide to Yoga Philosophy for Everyday Life
Where this comes up
Where this fits in a practice
The guides explain the idea in context; the service pathways are there when reading is not enough. Educational content only — nothing here is medical or mental-health care.