Easter commemorates the crucifixion and resurrection of Jesus. It is celebrated on the first Sunday after the Paschal full moon, which is the first full moon on or after 21 March. The date is moveable because of the desire to associate Easter with the date of the Jewish feast of Passover which, Christians believe, is when Jesus was crucified.
In countries with large Christian populations, Easter is often a public holiday. As Easter always falls on a Sunday, many countries in the world also recognize Easter Monday as a public holiday. Good Friday, which occurs two days before Easter Sunday, is also a public holiday in many countries.
The custom of the Easter egg, according to many sources, can be traced to early Christians of Mesopotamia, and from there it spread into Eastern Europe and Siberia through the Orthodox Churches, and later into Europe through the Catholic and Protestant Churches. Mediaevalist scholars normally conclude that the custom of Easter eggs has its roots in the prohibition of eggs during Lent after which, on Easter, they have been blessed for the occasion.