 Church service, a church service also called a service of worship, or simply a service is a formalized period of Christian communal worship, often held in a church building. It often but not exclusively occurs on Sunday, or Saturday in the case of those churches practicing seventh-day sabbataricism. The church service is the gathering together of Christians to be taught the word of God the Christian Bible and encouraged in their faith. Technically, the church in church service refers to the gathering of the faithful rather than to the building in which it takes place. In most Christian traditions, services are presided over by clergy wherever possible. Services of service vary greatly, from the Anglican, Eastern Orthodox, Oriental Orthodox, Presbyterian, Roman Catholic, and the front traditions of liturgical worship to the evangelical Protestant style, that often combines worship with teaching for the believers, which may also have an evangelistic component appealing to the non-Christians or skeptics in the congregation. Quakers and some other groups have no formal outline to their services, but allow the worship to develop as the participants present feel moved.