Okay kiddo, do you know what medicine is? It's when doctors use special treatments and medicines to make people feel better. Now, there is a group of people called the Royal Society of Tropical Medicine and Hygiene. They get together to talk about and solve problems related to diseases that happen in tropical places.
These tropical places have different types of diseases than we have here, like malaria and dengue fever. The people in the Royal Society study these diseases and try to find ways to prevent them or make them less dangerous.
They also think about how to improve the living conditions for people in these places so they don't get sick as often. They might talk about things like making sure everyone has clean water or ways to keep mosquitoes away.
Overall, the Royal Society of Tropical Medicine and Hygiene is a group of smart people who want to help make the world a healthier place.