Built-in designs refer to pre-existing templates or features integrated into a product or system. These designs simplify the user experience by providing ready-made options that can be easily customized. For example, software applications often include built-in designs for user interfaces, allowing users to create visually appealing layouts without needing extensive design skills. In the context of architecture, built-in designs can refer to elements like cabinets, shelves, or seating that are constructed as part of a building's structure. These features maximize space efficiency and enhance functionality, making them popular choices in both residential and commercial settings.