Explanation:

Both early Chaityas and Viharas were made by woods and later stone-cut Chaityas and Viharas were made.Chaitya was a rectangular prayer hall with a stupa placed in the centre, the purpose was prayer.The Chaitya was divided into three parts, and had an apsidal ending, that is, a semicircular rear end.The central part of the hall (also called the nave) was separated from the two aisles by two rows of pillars.The chaityas also had polished interior walls, semicircular roofs and horse-shoe shaped windows called the Chaitya windows.
Viharas were the residences of the monks. The term is also found in Ajivika, Hindu and Jain monastic literature, usually referring to temporary refuge for wandering monks or nuns during the annual Indian monsoons.Typical large sites such as the Ajanta Caves, Aurangabad Caves, Karli Caves, and Kanheri Caves contain several viharas. Some included a chaitya or worship hall nearby.