A school of fish is a group of fish that swim together in a coordinated manner. This behavior helps them avoid predators, find food, and navigate their environment more effectively. Schools can vary in size, from a few fish to thousands, and often consist of the same species, such as herring or sardines. Fish in a school communicate through movements and changes in speed, allowing them to stay together. This social behavior is not only beneficial for safety but also enhances their chances of survival in the wild. Schools of fish can be found in oceans, rivers, and lakes around the world.