Open communion
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In Christian churches, Open Communion is the practice of serving of the elements of communion (also called Eucharist, The Lord's Supper) to any who can affirm that they are a Christian. The phrasing and exact requirements of a particular local church can vary, but in contrast to closed communion, membership in a particular Christian community is not required. See also intercommunion.
Most Protestant churches practice open communion. Notable exceptions include the Church of Jesus Christ of Latter-day Saints, some Reformed tradition churches and the Lutheran Church - Missouri Synod.