Christians celebrate Easter because it was the day Jesus rose from the dead, after being crucified on the cross (Good Friday)
To the Christians, Easter is the most important celebration of the year. More important than Christmas. It symbolises victory over death, for Jesus, arose from the death, leaving an empty tomb.
Easter means renewal and revival. That you can be dead to your old self, and still arise victorious. That you can bury the dead, the hatchet and your sins, and still awake fresh and start over, no matter what lies in your past.
For those who celebrate, happy easter to you and your family.