Variation refers to the differences found among individuals within a species. These differences can be in physical traits, behaviors, or genetic makeup. For example, in a population of dogs, some may be larger or have different fur colors, while others may exhibit distinct temperaments. Variation is essential for the process of evolution, as it provides the raw material for natural selection to act upon. In addition to biological contexts, variation can also apply to other fields, such as music or art. In music, variations can involve changes in melody or rhythm, creating unique interpretations of a piece. Similarly, in art, variation can be seen in different styles or techniques used by artists, contributing to the richness and diversity of creative expression.