The celebration of the sacrament includes the following principal elements: the "priests of the Church" - in silence - lay hands on the sick; they pray over them in the faith of the Church - this is the epiclesis proper to this sacrament; they then anoint them with oil blessed, if possible, by the bishop.
These liturgical actions indicate what grace this sacrament confers upon the sick.
Source: Catechism of the Catholic Church (Vatican.va)