This Upaniṣad on Kuṇḍalinī Yoga belongs to Kriśna Yajurveda. There are three chapters in it. In the first chapter, the two causes of Citta Vṛtti, the three methods of controlling Prāna - moderation in diet, Āsana and Śakti Cālini Mudrā are described. Then Sarasvati Cālana, types of Prānāyāma - Sūryabhedi, Ujjāyi, Shītali, Bhastrikā, etc., three Bandhas - Moola Bandha, Uddiyāna Bandha and Jālandhara Bandha, obstacles in yoga and protection from them, awakening of Kuṇḍalinī through yoga practice, penetration of three Granthis Brahmagranthi, Viśṇugranthi and Rudragranthi, Kuṇḍalinī entering Sahasrāra Cakra (thousand petalled lotus), dissolution of Prāna, etc. into Śiva, realization of Self everywhere during Samādhi and subjects like Samādhi Yoga, etc. are described in detail.The second chapter begins with the lucid explanation of Khecari Mudrā. The features of Khecari, its results, perfection of Khecari by Mantra Japa, sequence of Khecari practice, etc., are described elaborately.In the beginning of third chapter the Khecari Melana Mantra for Khecari Siddhi is described specifically. The vision of a Sādhaka during his Sādhanā is described by giving examples of new moon, first lunar date and full moon. Then attaining perfection for the union with macrocosm through Prānāyāma, impossibility of Self-realization without practice, knowledge of the Brahman through the discourse of a Sadguru, manifestation of Brahma in the form of Vāk, Vṛtti and Vishva, etc., the nature of Parabrahma and at the end, means to attain Brahma - Dhyāna, Jīvanmukti and Videhamukti, etc., topics are explained.Thus, the major subjects of Yoga are presented in this Upaniṣad, which makes it unique and complete.