Easter is a Christian holiday celebrating Jesus' resurrection. However, many Easter traditions predate Christianity and have pagan origins related to springtime fertility. The date of Easter varies annually based on the first Sunday after the full moon following the spring equinox. Lent is the 46 day period before Easter emphasizing penance. Holy Week includes Palm Sunday, commemorating Jesus' entry to Jerusalem, and ends with Easter Sunday celebrating his resurrection. Decorating and giving eggs on Easter symbolizes new life and dates back to pre-Christian traditions. The Easter bunny also has roots in pre-Christian symbolism of rabbits as fertile animals of spring.