Yajurveda is the second of the four Vedas. Yajurveda means the Veda of the Yajus. Yajus were mantras sung during religious activities. Yajurveda is divided into two parts. The name of the first part is Black Yajurveda, called Taittiriya.The Taittirīya Upanishad is a Vedic era Sanskrit text, embedded as three chapters of the Yajurveda. It is a mukhya Upanishad, and likely composed about 6th century BC. The Taittirīya Upanishad is associated with the Taittirīya school of the Yajurveda, attributed to the pupils of sage Tittiri. The name of the second part is White Yajurveda,is called Vajasaneyi.