Human Computer Interaction (HCI) is a multidisciplinary field that focuses on the design and use of computer technology, particularly on the interfaces between humans and computers. Coursera's HCI catalogue teaches you how to create user-friendly interfaces and improve overall user experience. You'll learn about cognitive aspects of HCI, design thinking, principles of user interface design and usability testing. This knowledge can be applied in various fields, from software development to digital marketing, enhancing your ability to develop and implement user-centered technological solutions.