User interface (UI) design focuses on creating interfaces that users find easy to use and pleasurable by considering visual elements like style. User experience (UX) design involves designing the entire process of acquiring and integrating a product, including aspects like branding, usability, and function to provide meaningful experiences to users. When designing interactions, designers should consider qualities like defining how users interact, giving clues before actions, anticipating and mitigating errors, and simplifying for learnability.