Sankrit term for "bondage" or "to bind together." Primarily used to refer to our psycho-spiritual conditioning, but can also be used to refers to postures in Hatha Yoga.
""What is Banḍha [bondage]? Such Saṅkalpas [thoughts] as "I was born," etc., arising from the affinities of beginningless Ajñāna form bondage. The thought obscuration [or mental ignorance] of the mundane existence of "mine" in such as father, mother, brother, wife, child, house, gardens, lands, etc., forms bondage. The thoughts of I-ness as actor, etc., are bondage. The thought of the development in oneself of the eight Siḍḍhis (higher psychical powers) as Anima and others is bondage. The thought of propitiating the angels, men, etc., is bondage. The thought of going through the eight means of Yoga practice, Yama, etc., is bondage. The thought of performing the duties of one's own caste and order of life is bondage. The thought that command, fear and doubt are the attributes of [or pertain to] Āṭmā is bondage. The thought of knowing the rules of performing sacrifices, vows, austerity and gift is bondage. Even the mere thought of desire for Moksha (emancipation) is bondage. By the very act of thought, bondage is caused." - Nirālamba Upanishaḍ of Śukla-Yajurveḍa
"1. What is Banḍha [bondage]? Āṭmā [the Self] falsely superimposing the body and others which are not-Self upon Himself, and identifying Himself with them—this identification forms the bondage of the Self."
"2. What is Moksha [emancipation]? The freedom from that [identification] is Moksha." - Sarvasāra-Upanishaḍ of Kṛshṇa-Yajurveḍa