Service of worship
A service of worship is a religious meeting where people come together, usually in a church or cathedral, in order to worship God. It may also be called a church service or just service. It is the usual term used in the Christian religion for such a meeting. The term is also used sometimes in Judaism.
In the Christian churches services are normally held on Sundays, although there may be services on other days as well, especially in large churches or cathedrals.