In this introduction, the author gives a brief definition of UX and UI before providing a list of different companies that use them.
UX: User experience design focuses on how the user interacts with an interface or a website. It is the process of designing these interactions so that they are both intuitive and easy to navigate.
UI: User interface design is about creating interfaces for websites or devices that are easy to use and navigate by users. This includes interaction design, visual design, and information architecture