This document provides an introduction to UI/UX design. It defines UX as user experience design, which focuses on the user's emotions and feedback, and UI as user interface design, which defines the purpose and functionality of an app. The document outlines some basic principles of UI design like using clarity, consistency, established patterns, and visual hierarchy through typography, white space, and limited use of color. It emphasizes designing for legibility, readability, and creating a strong visual hierarchy through intentional use of white space.