The lay practicioners (Tibetan: Ge Nyen. Sanskrit: Upasaka) have at least the vow of refuge and perhaps one or several of five precepts which forbid murder, stealing, sexual misconduct, lying and indulging in intoxicants.
Fully ordained monks (Tibetan: Gelong. Sanskrit: Bhiksu) are subject also to chastity, and respect a code of discipline explained in the Vinaya by the Buddha himself and which is comprised of 253 diverse vows regulating in the smallest details, the attitude, the behavior, the clothing, the walk, nourishment, etc. of the monks.
see also: Bhikkhu