The Plymouth Brethren is a Christian movement that originated in the early 19th century in England. It emphasizes a simple, non-denominational approach to worship and focuses on the authority of the Bible. Members often gather in small groups, known as assemblies, to share teachings and partake in communion. The movement is characterized by its belief in the priesthood of all believers, meaning that every member can participate in worship and ministry. Plymouth Brethren communities are known for their distinct practices, such as abstaining from certain social activities and maintaining a separation from mainstream society, which they view as inconsistent with their faith.