"Quite simply, the liturgical year is
the celebration of a series of religious
feasts and seasons. In so doing, we
make sacred the ordinary time of a
twelve-month calendar. "
catholicstraightanswers.com
Advent - four weeks of preparation before the celebration of Jesus' birth
Christmas - recalling the Nativity of Jesus Christ and his manifestation to the peoples of the world
Lent - a six-week period of penance before Easter
Sacred Paschal Triduum - the holiest "Three Days" of the Church's year, where the Christian people recall the suffering, death, and resurrection of Jesus
Easter - 50 days of joyful celebration of the Lord's resurrection from the dead and his sending forth of the Holy Spirit
Ordinary Time - divided into two sections (one span of 4-8 weeks after Christmas Time and another lasting about six months after Easter Time), wherein the faithful consider the fullness of Jesus' teachings and works among his people.
Source: USCCB
For more information, visit the USCCB website
Access the 2023 Liturgical calendar here from GCatholic.org