Bhakti is sometimes private inside household shrines and sometimes practiced as a community. It may include Puja, Aarti, musical Kirtan or singing Bhajan, where devotional verses and hymns are read or poems are sung by a group of devotees. While the choice of the deity is at the discretion of the Hindu, the most observed traditions of Hindu devotionalism include Vaishnavism (Vishnu), Shaivism (Shiva) and Shaktism (Shakti). A Hindu may worship multiple deities, all as henotheistic manifestations of the same ultimate reality, cosmic spirit and absolute spiritual concept called Brahman in Hinduism.