Lord of death and the realm of the dead. Not to be confused with Mrityu, the death.
His mount is the buffalo Paundraka. His weapon is Kaladanda, the staff (danda) of time (kala). He is the guardian of the southern direction.
Yama judges the deceased, seated on the throne Vicharabhu, in the hall of the court, Kalichi, which is in Yamapura (Yamacity). Chitragupta is his accountant who records the deeds of the people in the book Agrasandhani.
Read about Yama here
Yama appears in many myths, the most famous are
Savitri and Satyavan