Adaptation (evolutionary biology) is a trait or characteristic of an organism that enhances its survival and reproductive success in a particular environment. This term also denotes the evolutionary process by which populations acquire such traits, primarily through natural selection acting on heritable variation, leading to an improved fit between the organism and its environment over generations. Understanding adaptation is a central concept in evolutionary biology, explaining the diversity of life and the complex relationships between organisms and their ecological niches. The study of adaptation is critical in various biological disciplines, including biomechanics (analyzing the functional consequences of adaptive traits) and ecological studies (investigating responses to environmental pressures such as climate change).