User-Centered Design (UCD) is a fundamental approach in UX and product design that focuses on the needs, preferences, and behaviors of users. This methodology prioritizes understanding user requirements through methods like user research, usability testing, and feedback. Key concepts in UCD include user personas, iterative design, and accessibility, which help ensure that products are both functional and enjoyable to use. Practitioners employ various techniques such as interviews, surveys, and prototyping to gather insights and refine their designs. Terms related to interaction design, user experience, and usability are commonly found in this area, making it essential for both beginners and seasoned professionals. By emphasizing the user experience, UCD aims to create intuitive and accessible products that meet real user needs.