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+## What is Responsive Web Design
+
+**Responsive web design (RWD)** is a development approach that allows for elements to dynamically change its appearance or layout depending on screen size. For example, elements may reorder, grow/shrink in size depending on the size of the screen.
+
 # Flexbox
+There are different methods for incorporating responsive design. In this lab, we will explore a tool called **Flexbox** that helps create a fluid layout for website responsiveness. To learn more about other methods, check out [MDN Doc on responsive design](https://developer.mozilla.org/en-US/docs/Learn/CSS/CSS_layout/Responsive_Design).