Human-computer interaction, or HCI, is the study of human interaction with computers. It is an intersection of computer science, behavioral science, design, psychology, and many more. It is a relatively young field but growing rapidly and therefore promises to make me a lot of money. Typically, people who study HCI work in small teams of designers and researchers in order to maximize the user experience. While most people think of large corporations such as Google, Apple, or Facebook, HCI is a common field utilized in many companies, especially IT consulting companies.