Here's a look at what you need to know about Easter and Holy Week.
On Easter Sunday, Christians celebrate the resurrection of Jesus Christ on the third day after his crucifixion. It also marks the end of the 40-day period of penance called Lent. Easter is considered to be the most important season of the Christian year.
Easter: April 20, 2014 - Easter Sunday
It is celebrated on the first Sunday after the first full moon following the first day of spring.
In some countries, Easter is called "Pascha", which comes from the Hebrew word for Passover.
The Jewish holiday of Passover took place just before Christ's crucifixion and resurrection.
The Eastern Orthodox Church uses other factors to determine the date and will celebrate this year on May 5.
Christianity is one of the world's largest religions, with approximately two billion followers around the world.
Holy Week: Palm Sunday April 13, 2014 - Palm Sunday
For Christians, Palm Sunday commemorates Jesus' arrival in Jerusalem prior to his crucifixion, where palm leaves and clothing were laid in his path.
Palm Sunday is often celebrated with a procession and distribution of palm leaves.
In some churches, the palms are saved and burnt into ashes to be used on Ash Wednesday of the next year.
Palm Sunday is also called Passion Sunday.
It is the last Sunday of Lent and first day of Holy Week.
Maundy Thursday April 17, 2014 - Maundy Thursday, also called Holy Thursday.
The observance commemorates the Last Supper, before Jesus' crucifixion.
Some churches hold a special communion service.
Good Friday April 18, 2014 - Good Friday.
For Christians, it is a day of mourning and penance. Good Friday marks the day Jesus died on the cross.
Good Friday is celebrated the Friday before Easter Sunday.