Common features refer to the shared characteristics or traits that different objects, people, or concepts possess. These features help categorize and identify items within a group, making it easier to understand their similarities and differences. For example, birds typically have feathers, beaks, and the ability to fly, which are common features that distinguish them from other animals. In various fields, recognizing common features can aid in analysis and comparison. In biology, for instance, scientists may study the common features of mammals to understand their evolutionary relationships. Similarly, in design, common features in products can enhance user experience by providing familiarity and ease of use.