The egg is a pagan symbol of the rebirth of the Earth in celebrations of spring and was adopted by early Christians as a symbol of the resurrection of Jesus.
The oldest tradition is to use dyed or painted chicken eggs, but a modern custom is to substitute chocolate eggs, or plastic eggs filled with confectionery such as jelly beans. These eggs are often hidden, allegedly by the Easter Bunny, for children to find on Easter morning. Otherwise, they are generally put in a basket filled with real or artificial straw to resemble a bird's nest.
Here are examples of the biggest Easter eggs around the world: