It is for those who spent the month of Ramadan in complete devotion to Allah. Eid is a time when the entire Muslim community comes together to share in each others joy and blessings and also to lessen the burden of those who may be suffering.
The celebration of Eid ul-Fitr culminates a month of fasting wherein the faithful have spent their time praying and beseeching God for forgiveness and mercy. For many, Ramadan was not just an abstention from food and drink. Rather, it was an exercise in patience and discipline. Eid is the celebration for those who fasted and obeyed God's rules and teachings.