The Association of Commonwealth Universities is a group of universities from countries that used to be under the rule of the British Empire. It's like a club where these universities get together and share ideas and research, and work together to improve education for everyone. Imagine you and your friends formed a club where you meet up regularly to learn new things and help each other with schoolwork – it's kind of like that, but for universities in different countries. By working together, the universities in the Association of Commonwealth Universities can help create better opportunities for students and researchers from all over the world.