Natural selection is a process in nature where organisms that are better adapted to their environment tend to survive and reproduce more than those that are not. For example, in a population of birds, those with stronger beaks may find it easier to crack open seeds, allowing them to get more food. Over time, these birds will have more offspring, passing on their strong beak traits. As a result, the traits that help organisms survive become more common in the population. This gradual change can lead to the development of new species. Charles Darwin famously studied this process, helping us understand how life evolves on Earth.