Biosimulation is like a virtual experiment. It's like when you play a video game – instead of running around in the real world, you're running around in a world on your computer. With biosimulation, instead of running around in a virtual world, scientists can study real-world processes without having to actually do the experiments in the real world. By putting different things into the biosimulation, they can see how they would interact, like how certain medicines would interact with disease, or how a certain bacteria would spread in a population. Instead of having to wait to see what happens in the real world, they can find out what can happen using biosimulation.