A sacrament is a visible sign instituted by Jesus Christ through which invisible grace and sanctification are communicated to us. Christ instituted seven Sacraments: Baptism, Confirmation, Holy Eucharist, Penance (Reconciliation), Extreme Unction (Holy Anointing), Holy Orders, and Matrimony.
From where do we derive the ceremonies which, with the signs instituted by Christ, are used in administering the Sacraments? From the Church which, with the assistance of the Holy Spirit, has ordained these ceremonies to increase our reverence and respect while imparting the Grace of God.
For more on the Sacraments of Jesus in the Holy Church, pease reference the current Catechism of the Catholic Church #1113-1134 (which also has Biblical & Traditional footnotes). An on-line version is available: https://www.vatican.va/archive/ENG0015/_INDEX.HTM