Easter, Pascha, or Resurrection Day, is an important religious feast in the Christian liturgical year. It celebrates the resurrection of Jesus, which Christians believe occurred on the third day after his crucifixion some time in the period AD 27 to 33.
Easter also refers to the season of the church year called Eastertide or the Easter Season. Traditionally the Easter Season lasted for the forty days from Easter Day until Ascension Day but now officially lasts for the fifty days until Pentecost. The first week of the Easter Season is known as Easter Week or the Octave of Easter.