An International Union for the Study of Social Insects is like a special club where people who are interested in studying social insects can come together to share their knowledge and learn from each other. Social insects are special creatures like ants, bees, termites, and wasps that live and work together in big groups called colonies.
The club helps scientists from all around the world to come together to study these interesting creatures, and to figure out how they communicate with each other, find food, build their homes, and work together to survive. It helps scientists to talk to each other about their findings, and to work together to solve big problems related to social insects, such as how they affect our environment or our agricultural systems.
It's like a big family of scientists who all love social insects and want to work together to learn more about them and help protect them.