The title "Christ" means "Anointed One" (Messiah).Jesus is the Christ, for "God anointed Jesus of Nazareth with the Holy Spirit and with power" (Acts 10:38). He was the one "who is to come" (Lk 7:19), the object of "the hope of Israel" (Acts 28:20).
Source: Catechism of the Catholic Church (Vatican.va)