The tradition of Easter and its bunny
History tells us about Easter that the First Council of Nicaea established the date of Easter as the first Sunday after the Paschal full moon following the northern hemisphere's vernal equinox.
The date of Easter varies between March 22 and April 25. It's a christian tradition celebrated in honor of Jesus rising from his grave three days after his crucifixion. The first mentioning of the Easter bunny was done in Northern Europe by George Franck von Frankenau's in his book About Easter Eggs referring to a French/German tradition of an Easter Hare bringing Easter Eggs. When the tradition crossed the Atlantic the hare gradually changed into a bunny. In modern-day culture its assumed that an Easter bunny is hiding the eggs.
History tells us that it's customary for children to search the eggs and that the one responsible for hiding them being the Easter bunny. Usually it's a family activity done with mostly smaller children where the parents will help their children as they try to outsmart them by finding all his hidden eggs. In modern times the eggs are usually made of chocolate to reward the children for their effort. But why does the Eastern bunny have such a need for leaving eggs, why not carrots?
Originally in Pagan celebrations of spring the egg was a symbol of the rebirth of the earth and was adopted by early Christians as a symbol of the rebirth of man at Easter. There are other legends about the reason why eggs are used during Easter and most of them have a part that involves Maria Magdalene. But this doesn't explain the fact that they're colored. The origin of the Easter bunny in the U.S.A. stems from German settlers who brought their tradition of the 'Oschter Haws' in the 18th century across the Atlantic. Originally Easter eggs were painted with bright colors to represent the sunlight of spring and were used in egg-rolling contests or given to beloved ones. After they were colored and etched with various designs the eggs were exchanged by lovers and romantic admirers instead of roses. In medieval times eggs were traditionally given at Easter to the servants. In Germany eggs were given to children along with other Easter gifts.
Legend says that the Easter bunny would leave brightly colored eggs for all good children on Easter morning. So the children used to build nests for the Eastern bunny as hiding spots, this was usually done with a hat. Over time this tradition evolved and it became customary for the Eastern bunny to hide his eggs and have the children find them. This tradition has become such a great part of Easter that's become impossible to separate the two of them, due to the overwhelming popularity of egg searching large contests are organized with some ranking in the thousands of participants.
In modern-day popular culture the Eastern bunny is usually used to advertise chocolate and other holiday related items. It's possible in modern computer programs or websites to find a hidden feature which is named an Easter egg. This is usually done as a joke by the developers, but it has become a sport for some people to find this hidden content. An example of google easter eggs can be found here.