UI (User Interface) design is the design of user interfaces for machines and software, such as computers, home appliances, mobile devices, and other electronic devices, with a focus on maximizing usability and the user experience. UI design typically refers to graphical user interfaces but also includes others, such as voice-controlled interfaces.
UX (User Experience) design is the process of designing (digital or physical) products that are useful, easy to use, and enjoyable to interact with. The goal of UX design is to create a product that provides a positive experience to the user, by making the product easy to use and ensuring that it meets the user's needs.
Both UI and UX design are important for creating products that are not only functional but also pleasant to use. They involve different skill sets and focus on different aspects of the product, but they often overlap and work together to create a cohesive user experience.