What are the different types of roux and how do they differ in terms of color and flavor?

There are three main types of roux: white, blond, and brown. White roux is cooked for a short time and has a light color and mild flavor. Blond roux is cooked a bit longer, resulting in a slightly darker color and nuttier flavor. Brown roux is cooked the longest, giving it a deep brown color and a rich, toasty flavor.