The Sacrament of Holy Communion is the third of the Sacraments of Initiation. Even though we are required to receive Communion at least once per year (our Easter Duty), and the Church urges us to receive Communion frequently (even daily, if possible). It is called a "Sacrament of Initiation" because, like Baptism and Confirmation, it brings us into the fullness of our life in Christ.
In Holy Communion, we are eating the True Body and Blood of Jesus Christ, without which: "you shall not have life in you" -(John 6:53)
You are also invited to participate in Eucharistic Adoration.