Imagine there's a big group of grown-up people who live in different parts of the world, and some of them need help. Maybe they don't have enough food, or they're sick and need medicine, or they don't have clean water to drink.
The Department for International Development (DFID) is like a big group of helpers who work for the government. They have a special job to help these grown-up people in other parts of the world. They try to make sure that everyone has the things they need to be healthy and happy, like food, medicine, and clean water.
DFID talks to people in different countries to find out what they need, and then they work with other grown-up helpers to make things better. They might send money or supplies to other countries, or they might teach people new ways to grow food or make clean water. DFID wants everyone to have the chance to grow up healthy and strong, no matter where they live in the world.