What is natural selection and how does it shape evolution?

 Natural selection is one of the basic mechanisms of evolution, along with mutation, migration, and genetic driftIt is a process where organisms that are better adapted to an environment will survive and reproduceEvolution is a change in the inherited characteristics of a population over time through the process of natural selection, which may result in the formation of new speciesThe main difference between natural selection and evolution is that natural selection is the differential survival and/or reproductive success among the individuals within a species whereas evolution is the change in the heritable characteristics of a population over successive generations.