The Christian Brethren, also known as the Plymouth Brethren, is a Christian movement that originated in the early 19th century in the United Kingdom. It emphasizes a simple, non-denominational approach to worship and fellowship, focusing on the authority of the Bible and the priesthood of all believers. Members often gather in small groups, known as assemblies, to share in communal worship and study. The movement is characterized by its commitment to a literal interpretation of Scripture and a desire for spiritual purity. Christian Brethren typically practice baptism by immersion and partake in the Lord's Supper regularly, viewing these practices as essential expressions of their faith.