The Catholic Sacrament of Holy Communion
Of all seven sacraments, the Holy Eucharist, or Holy Communion, is the most central and important to Catholicism. Holy Communion is offered at every Mass, and in fact, the ritual of the Mass is largely taken up with preparing the hosts (wafers made of wheat and water, or gluten-free) and wine to become the body and blood of Christ and the congregation to receive the body of Christ. Transubstantiation is the act of changing the substances of bread and wine into the substances of the Body and Blood of Christ.
The Holy Eucharist refers to Christ’s body and blood present in the consecrated host on the altar, and Catholics believe that the consecrated bread and wine are actually the body and blood, soul and divinity of Christ. For Catholics, the presence of Christ in the Holy Eucharist isn't just symbolic, it’s real.
When you receive Holy Communion, you’re intimately united with Jesus Christ — he literally becomes part of you. Also, by taking Holy Communion, you express your union with all Catholics who believe the same doctrines, obey the same laws, and follow the same leaders. This sense of participation in a larger community is why Catholics (and Eastern Orthodox Christians) have a strict law that only people who are in communion with the Church can receive Holy Communion. In other words, only those who are united in the same beliefs are allowed to receive Holy Communion.
Receiving Communion according to Rite
The Holy Eucharist is food for the soul, so it’s given and eaten during Holy Communion at the Mass. However, how it’s distributed varies a bit, depending on whether you attend a Latin (Western) Rite Mass or a Byzantine (Eastern) Rite Mass:
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Latin (Western) Rite: Holy Communion is in the form of consecrated unleavened hosts made from wheat flour and water, just like the unleavened bread used by Jesus at the Last Supper. The host is flat and the size of a quarter or half-dollar. Latin Catholics may receive the host on their tongue or in their hand if the local bishop and the national conference of bishops permit.
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Byzantine (Eastern) Rite: Catholics receive consecrated leavened bread (the yeast or leaven symbolizes the Resurrection), which is placed inside the chalice (cup) of consecrated wine. The priest takes a spoon and gingerly places a cut cube of consecrated bread soaked in the consecrated wine inside the mouths of the communicants without ever touching their lips or tongue.
Dressing up for your First Holy Communion
When boys and girls make their First Holy Communion (usually in second grade), it’s a big occasion for Catholic families. Like their Baptism, the day of First Communion is one filled with family, friends, and feasting after the sacred event has taken place in church.
Girls typically wear white gowns and veils and often look like little brides, and boys wear their Sunday best or new suits and ties bought for the occasion.
The children are generally too young to appreciate all the theological refinements, but as long as they know and believe that it’s not bread or wine they’re receiving but the real Body and Blood of Jesus Christ, then they are old enough to take Holy Communion.
You must make your First Penance, which is going to confession for the first time, before making your First Communion.

Catholicism Glossary
Advent
The religious season before Christmas when Christians prepare to celebrate the birth of Christ.

Catholicism Glossary
altar
A raised table-like structure from which a priest celebrates Mass.

Catholicism Glossary
annulment
A canon law decree that declares that a marriage was never a valid sacrament in the first place, usually because one or both of the partners did not enter into it with good faith and intentions.

Catholicism Glossary
apostles
The 12 men who accompanied and supported Jesus and were trained by him to spread Christianity.

Catholicism Glossary
archdiocese
A large diocese run by an archbishop.

Catholicism Glossary
Ash Wednesday
The first day of Lent when Catholics are anointed with ashes as a reminder of their mortality.

Catholicism Glossary
Baptism
The essential sacrament that washes away original sin and welcomes the baptized person into the Church.

Catholicism Glossary
Holy Trinity
The Catholic belief that God, the one Supreme Being, is made up of three persons: God the Father, God the Son, and God the Holy Spirit.

Catholicism Glossary
bishop
A man ordained first to the priesthood, then elevated to the next level by the pope. A bishop oversees a diocese; an archbishop oversees an archdiocese.

Catholicism Glossary
Byzantine Catholicism; Eastern Catholicism
A branch of Catholicism that recognizes the authority of the pope and celebrates the sacraments, but whose rituals differ from those of Western or Roman Catholic sects.

Catholicism Glossary
canon law
The supreme law of the Catholic Church that spells out the rules and regulations that guide the Church.

Catholicism Glossary
cardinal
An ordained man elevated to the step just below the pope. Cardinals help the pope administer to the faithful and a new pope is elected from among them when a pope dies.

Catholicism Glossary
catechism
A book that contains the doctrines of Catholicism.

Catholicism Glossary
celibacy
A formal and solemn oath to never enter the married state. Priests take a vow of celibacy.

Catholicism Glossary
chalice
The gold or silver cup that holds the wine that will become Christ’s body and blood during the Mass.

Catholicism Glossary
cleric
A member of the clergy.

Catholicism Glossary
confession; penance
A sacrament during which a Catholic confesses all known mortal sins to a priest.

Catholicism Glossary
Consecration
The part during the Mass when the priest changes the bread and wine into the body and blood of Jesus.

Catholicism Glossary
creed
A Christian oath, stating what Catholics believe as revealed to them by God through Sacred Scripture and Sacred Tradition. Key Catholic creed are the Apostles’ Creed and the Nicene Creed.

Catholicism Glossary
deacon
An ordained man who normally has no intention or desire of becoming a priest. A deacon may be single or married.

Catholicism Glossary
diocese
A collection of parishes overseen by a bishop.

Catholicism Glossary
feast day
The day in the Catholic calendar when a specific saint’s holy life and deeds are remembered.

Catholicism Glossary
genuflection
The act of touching the right knee to the floor while bending the left knee as a gesture of respect and obedience to God.

Catholicism Glossary
godparent
Sponsor to a child or adult being baptized.

Catholicism Glossary
Good Friday
The Friday before Easter Sunday; the day Jesus died on the cross.

Catholicism Glossary
grace
A totally free, unmerited gift from God. Grace is a sharing in the divine; the inspiration to do God’s will.

Catholicism Glossary

Catholicism Glossary
Heaven
A place of eternal joy and the ecstasy of dwelling with God.

Catholicism Glossary
Hell
A place of eternal torment and damnation.

Catholicism Glossary
Holy Communion; Holy Eucharist
The essential sacrament of Catholicism in which a host consecrated by a priest becomes literally the body and blood of Jesus and is received by the Catholic faithful.

Catholicism Glossary
holy day of obligation
A day in the Catholic calendar when all Catholics must attend Mass.

Catholicism Glossary
homily
The sermon given after the Gospel is read at Mass. Different than a sermon in that it’s a explanation and reflection on the Word of God, read only by clergy.

Catholicism Glossary
host
A wafer of bread used in a Eucharistic service. It becomes the Host (capitalized) when consecrated.

Catholicism Glossary
infallible
Incapable of error. The pope is believed to be infallible when he teaches a doctrine on faith or morals to the universal Church.

Catholicism Glossary
laity; lay people
Non-ordained, everyday Catholics. Members of a religious organization who are not clergy.

Catholicism Glossary
lector
A layperson trained for the task of reading at Mass.

Catholicism Glossary
Lent
The 40 days before Easter, when Catholics prepare for the death and resurrection of Jesus through fasting, abstinence, and prayer, often giving up a specific treat for the duration of the season.

Catholicism Glossary
Mass
The formal, official worship service of Catholicism. Catholics are required to attend Mass every Sunday and on holy days of obligation.

Catholicism Glossary
mortal sin
A sin that kills grace; committing a mortal sin is tantamount to choosing Hell over Heaven.

Catholicism Glossary
natural family planning NFP
The only sanctioned birth control method for Catholics, it relies on charting a woman’s fertile cycle and abstaining from sex during fertile periods to prevent pregnancy.

Catholicism Glossary
original sin
Sin passed down to every human from Adam and Eve; the Sacrament of Baptism washes it away.

Catholicism Glossary
parish
A collection of neighborhoods in one region of a county within a given state under the spiritual care of a priest.

Catholicism Glossary
pope
The supreme head of the Catholic Church.

Catholicism Glossary
priest
An ordained man responsible for administering the sacraments and tending to the spiritual health of his parishioners.

Catholicism Glossary
purgatory
A spiritual state of the soul in which it is purified before entering heaven.

Catholicism Glossary
sacrament
A rite established by Jesus Christ to bring grace to those participating in or receiving it. The seven sacraments of Catholicism are Baptism, Penance, Confirmation, Holy Eucharist, Matrimony, Holy Orders, and Anointing of the Sick.

Catholicism Glossary
seminarian
A student training for the priesthood.

Catholicism Glossary
seminary
The equivalent of Protestant divinity school where men are trained for the priesthood.

Catholicism Glossary
sign of the cross
A gesture of respect in which a Catholic uses the right hand to touch the forehead, then the middle of the breast, then the left shoulder, and finally the right shoulder.

Catholicism Glossary
Ten Commandments
God’s laws as given to Moses. Following the Commandments is the path to a holy life; breaking them is the basis of sin.

Catholicism Glossary
transubstantiation
The act of changing the substances of bread and wine into the Body and Blood of Christ.

Catholicism Glossary
Vatican
The physical seat of the Catholic Church; the pope lives and rules from the Vatican.

Catholicism Glossary
venial sin
A transgression that inflicts a slight wound to the soul and which may be forgiven by making a confession and a sincere act of contrition.