Darwinism is the theory of biological evolution developed by Charles Darwin. It explains how life on Earth changes over time through a process called natural selection. Natural selection favors organisms with traits that make them better suited to their environment. These organisms are more likely to survive and reproduce, passing these helpful traits to their offspring. Over many generations, this process can lead to the development of new species. For example, a giraffe with a longer neck might be better able to reach leaves on tall trees, giving it a survival advantage over shorter-necked giraffes. Darwinism emphasizes that all living things share a common ancestor and are related to one another.