An agence de coopération culturelle et technique is a fancy way of saying a group of people who work together to help different countries share ideas and learn from each other. Think of it like when you go to school and your teacher gives you and your classmates an assignment to work on together.
But instead of just your class, there are many countries involved! These countries have different cultures, languages, and ways of doing things. The people in the agence help these countries work together and share their ideas and knowledge with each other.
For example, they might help one country learn a new skill or technology from another country. They might also help different countries share their arts, music, and traditions with each other.
In short, an agence de coopération culturelle et technique is like a big group of friends who help each other grow and learn new things!