Easter primarily is the celebration of Jesus' triumph over death and mankind's hope for eternal life. Some of the main features behind the original Easter story are Jesus' execution, his burial and most significantly his rising from death. Christians believe that according to the Scripture, Jesus came back to life three days after his death on the cross, which is observed through the Good Friday, always the Friday before Easter. Through his death, burial and resurrection it is believed that Jesus paid the penalty for his sins and obtained eternal life for all who believe in him.
Although it is the celebration of the same truth in history, the methods of celebration differ quiet a bit. In USA the name of this Holy Day is Easter. It is derived from the pagan goddess of dawn, "Eostre". Since Eostre was a pagan goddess, in some churches it is considered inappropriate to refer to this Holy Day with the name of a pagan goddess. However, the word Easter is simply used to refer to this holiday only, with no connotation what so ever with the pagan goddess bared in mind. In most other languages including Greek, Easter is called Pascha, related to the Hebrew word Pesach, for Passover. This is because the early Christians linked this celebration to Passover.