Sacred Paschal Triduum - the holiest "Three Days" of the Church' 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
(Information from the United States Conference of Catholic Bishops)