Biostatistics is kind of like when we count things and do math to learn about people and animals and plants. It's like when we count how many birds are in our backyard or how many apples are in a basket.
But instead of just counting things, we also use data and numbers to answer questions about health and medicine. For example, people who study biostatistics might look at data about how many people get sick from a certain disease, or how well a certain medicine works to treat a particular sickness.
They might also use math to figure out how likely it is for someone to get sick, or how certain things like a person's age or gender might affect their health. Biostatistics helps doctors and scientists learn more about how to keep us healthy and how to treat us when we are sick.