A school of fish is a term used to describe a large group of fish swimming together in coordinated movements. This behavior serves several purposes. Firstly, it provides protection against predators, as the collective movement can confuse and deter attackers. Additionally, swimming in a school allows fish to conserve energy by taking advantage of the hydrodynamic benefits of swimming in groups. Furthermore, schools of fish facilitate efficient foraging, as individuals can share information about the location of food sources. Schools can vary in size, ranging from just a few fish to enormous gatherings consisting of thousands or even millions of individuals. Overall, the formation of schools is an adaptive behavior that enhances the survival and success of fish species in their respective environments.