Defining features are the essential characteristics that distinguish one object, concept, or entity from another. These features help to identify and categorize items, making it easier to understand their unique qualities. For example, the defining features of a dog include its ability to bark, its four legs, and its role as a domesticated pet. In various fields, such as biology or design, defining features play a crucial role in classification and analysis. In biology, the defining features of a species help scientists understand its behavior and habitat. In design, defining features can determine the functionality and aesthetic appeal of a product.