According to the History Channel, here is the story behind Easter Eggs.

Easter is a religious holiday, but some of its customs, such as Easter eggs, are likely linked to pagan traditions. The egg, an ancient symbol of new life, has been associated with pagan festivals celebrating spring. From a Christian perspective, Easter eggs are said to represent Jesus’ emergence from the tomb and resurrection. Decorating eggs for Easter is a tradition that dates back to at least the 13th century, according to some sources. One explanation for this custom is that eggs were formerly a forbidden food during the Lenten season, so people would paint and decorate them to mark the end of the period of penance and fasting, then eat them on Easter as a celebration.