The Zoroastrian hymns to individual deities are called the Yashts.
The Yashts are a collection of 21 Avestan hymns praising particular yazatas, or divine beings. They were composed in Young Avestan and preserve prayers, praises, myths, and stories connected with figures such as Mithra, Anahita, Tishtrya, and Verethragna. Some hymns focus mainly on a deity, while others recount the deeds of ancient heroes who worshipped that being.
The term is easy to confuse with Yasna. Yasna is the name of a major Zoroastrian liturgy, including the Gathas, and is associated with worship of the wider divine order. The Vendidad, by contrast, is primarily a law and purity text. Gathas are the oldest poetic hymns attributed to Zarathustra, not the general collection of deity hymns.
The Yashts remain part of Zoroastrian liturgical practice. Priests and laypeople may recite them, and many are connected with specific days and dedications in the Zoroastrian calendar. The collection’s hymns vary greatly in length and style.