The seven sacraments are the signs and instruments by which the Holy spirit spreads the grace of Christ the head throughout the Church which is his Body. CCC #774
Baptism, Confirmation, and Eucharist constitute the "sacraments of initiation" by which a believer receives the mission of original and personal sin, begins a new life in Christ and the Holy Spirit, and is incorporated into the Church, the Body of Christ.
Baptism: The first chief sacrament of forgiveness of sins because it unites us with Christ, who died for our sins and rose for our justification.
Confirmation: Completes the grace of Baptism by a special outpouring of the gifts of the Holy Spirit, which seal or "confirm" the baptized in union with Christ and equip them for active participation in the worship and apostolic life of the Church.
Holy Communion: The ritual, sacramental action of thanksgiving to God which constitutes the principal Christian liturgical celebration of and communion in the paschal mystery of Christ.
Reconciliation: The sacramental celebration in which, through God's mercy and forgiveness, the sinner is reconciled with God and also with the Church, Christ's Body, which is wounded by sin.
Anointing of the Sick: Administered by a priest to a baptized person who begins to be in danger of death because of illness or old age, through prayer and the anointing of the body with the oil of the sick. The proper effects of the sacrament include a special grace of healing and comfort for the Christian who is suffering the infirmities of serious illness or old age and the forgiving of the person's sins.
Marriage: A covenant or partnership of life between a man and woman, which is ordered to the well-being of the spouses and to the procreation and upbringing of children.