IN BRIEF
By his loving obedience to the Father, "unto death, even death on a cross" (Phil 2:8), Jesus fulfils the atoning mission (cf Is 53:10) of the suffering Servant, who will "make many righteous; and he shall bear their iniquities" (Is 53:11; cf. Rom 5:19).
Source: Catechism of the Catholic Church (Vatican.va)