UI : user interface (UI) is the series of screens, pages, and visual elements—like buttons and icons—that you use to interact with a device. The user interface (UI) is everything designed into an information device with which a person may interact. This can include display keyboards, a mouse and the appearance of a desktop. It is also the way through which a user interacts with an application or a website.
UX: User experience (UX), refers to a person's emotions and attitudes about using a particular product, system or service. User experience (UX) design is the process of creating products that provide meaningful and relevant experiences to users. This involves the design of the entire process of acquiring and integrating the product, including aspects of branding, design, usability, and function.