Universal design aims to make products and environments usable by all people without need for adaptation. It accommodates the needs of elderly people, those with disabilities, pregnant women, and others. Universal design principles provide guidance for inclusive design across different contexts and cultures. The seven principles are: 1) equitable use, 2) flexibility, 3) intuitive use, 4) perceptible information, 5) tolerance for error, 6) low physical effort, and 7) appropriate size and space. Universal design only addresses usability and other factors like cost must also be considered.