The core of design lies in being “human-centered,” and user-centered design further emphasizes the need to fully consider user requirements at every stage of product development. In this process, defining the user serves as a pivotal step, aiming to gain an in-depth understanding of the characteristics and needs of the target audience. By analyzing demographic traits and user behavior, it becomes possible to identify the needs and pain points of different user groups, create user personas, and provide a critical foundation for design decisions. This ensures that the product effectively meets user expectations and enhances the overall user experience.