What is a Sacrament? A Sacrament is an outward sign instituted by Christ to give grace.
an outward sign An outward sign is an action performed by a minister, usually a priest, using things (water, oil, etc.), words, and/or gestures which give significance to what is being done.
instituted by Christ Between the time He began public life and the time He ascended into heaven, Jesus fashioned the seven Sacraments. When He ascended into heaven, that put an end to the making of Sacraments. The Church cannot institute new Sacraments. There can never be more or fewer than seven Sacraments.
to give grace Grace is what is given to us by God so that we might have eternal life.