The four Cs of design are creativity, complexity, choice, and change. Creativity involves generating innovative and effective ideas to solve design problems. Complexity addresses the need to manage and simplify intricate design elements and user interactions. Choice relates to offering the user control and options within the product design, thereby enhancing personalization. Change is about adapting the design over time in response to evolving user needs, technological advancements, and market trends to ensure the product remains relevant and efficient. Together, these concepts guide designers in creating products that are not only functional and aesthetically pleasing but also user-friendly.