Easter Sunday in 2013 was celebrated on March 31. In Christian tradition, Easter is celebrated to commemorate Jesus Christ's resurrection three days after His crucifixion.
Easter Sunday falls on a different date every year, but it usually coincides with the March Equinox. This is because Jesus is believed to have been crucified around the time of the Jewish Passover, celebrated on the first full moon following the vernal equinox.
Catholics pray and fast for 40 days before Easter, during a period known as Lent. The Friday before Easter is known as Good Friday, which commemorates the crucifixion of Jesus Christ.