An aid convoy has started to enter the Syrian town of Madaya, where refugees have been trapped for six months.
In that time aid has not been able to reach the people in the town.
Different sides fighting in the civil war have come to a temporary agreement to allow the aid to be delivered.
The trucks have enough food to last 40,000 people for a month, according to the UN.
More than 60 lorries are entering the town, carrying water and basic food including rice, oil, flour, sugar, and salt.
They have also brought blankets and medicines.
Although the aid brings relief to the people living there, there are many other refugees in other parts of the country who still need help. Aid agencies hope to reach other towns soon.
The trouble in Syria began in March 2011 and the middle eastern country has been gripped by a brutal civil war ever since.
Since then, the United Nations estimates more than 250,000 people have died in the clashes between President Bashar al-Assad's government and rebel forces who want him out.
The UN's Refugee Agency says more than four million people have fled Syria to neighbouring countries, and over half of those are children.