Easter and Passover always fall close to each other but they are not always at exactly the same time.
For many centuries before Jesus' birth, the Jewish people had their own special spring festival, called Passover (Pesach).
Passover commemorates the time when God rescued the people of Israel from slavery and Moses led them out of Egypt. It is the Israelite's liberation from Egypt that led to the beginning of Judaism.
Jesus, a Jew, was crucified during Passover time and it is said that the Last Supper was a Passover seder (a ritual meal that commemorates the Biblical accounting of the Jews escape from Egyptian slavery). It is Jesus' crucifixion and resurrection that led to the start of Christianity.
Both Easter and Passover revolve around the idea of rebirth. Jesus is resurrected, or born again, and the slaves are reborn into freedom. Both festivals draw in the idea of birth or rebirth with Easter eggs and the hard-boiled eggs served on Passover.