This document provides an introduction to user experience (UX) design. It defines UX as involving a person's behaviors, attitudes, and emotions about using a product, in contrast to a user interface (UI) which is the means a person uses to control software or hardware. The history of UX/UI design is explored from the 1900s to the present. Current trends discussed include responsive web design, flat design, parallax effects, full-screen photo pages, and advanced scrolling. The UX design process and common tools used such as prototypes, mockups, and usability testing are also outlined.