The Anglican Communion distinguishes between full communion and intercommunion. It applies the first term to situations "where between two Churches, not of the same denominational or confessional family, there is unrestricted "communio in sacris" including mutual recognition and acceptance of ministries", and the second term to situations "where varying degrees of relation other than full communion are established by agreement between two such Churches". This distinction differs from the distinction that the Catholic Church makes between full and partial communion in that the Anglican concept of intercommunion implies a formal agreement entered into by the churches concerned. As with other Protestant traditions, the Anglican understanding of full communion differs from that of the Roman Catholic Church and Eastern Orthodoxy, which consider that full communion between churches involves them becoming a single church, as in the case of the particular churches "in which and formed out of which the one and unique Catholic Church exists".