Interactions between individuals are the core of the study of ecology. One of the more important interactions is predation, an interaction where one of the individuals, the predator, benefits from the interaction by consuming the other, the prey, which is negatively affected by the interaction, as it can be severely harmed or even killed. As important as it is, predation affects not just at the individual, but scales up at higher level of biological organization, such as populations and communities. In this article, the aim is to provide an overview of the effects of predation in different levels, as well as the role predation plays on the evolution of species. Examples are used to make easier to understand the concepts. I expect that after reading this short article, readers will be convinced that predation is not just an interaction that affects two individuals (predator and prey), but has deeper implication on different levels of organization, from individuals to communities, and as such, that predation is one of the most important factors modulating the evolution of species.