Life inside a vihara is regulated by the Vinaya, the extensive body of monastic discipline the Buddha and the early community are held to have established, and the building's layout reflects this regulation directly: individual cells give each monk or nun a private space for meditation and rest, while shared halls support the communal activities the Vinaya requires, chanting, teaching and the periodic recitation of the monastic code itself. Ordained residents do not prepare their own food in the traditional pattern; in Theravada practice especially, monks leave the vihara each morning on an alms round, receiving food offered by lay supporters, an exchange understood as generating merit for the giver as much as sustenance for the receiver, and returning to eat before midday, after which solid food is traditionally set aside until the following morning.
A vihara's shrine room, distinct from the monks' residential quarters, houses an image of the Buddha and serves both the resident community's own devotional practice and lay visitors who come to make offerings or hear teaching, so the building typically separates a more public devotional space from the private residential cells behind or around it. Larger viharas historically supported considerable internal specialization, with some resident monks focused on textual study, others on meditation practice, and others on the practical administration that any settled institution requires, a division of labor visible archaeologically in the varied room types larger monastic sites preserve.