So far, all of the programming that we have done has been part of a text interface. The programs print information to a terminal window and to give them input we enter text from the keyboard. These types of programs have their place in computing, but these days very few people actually use such programs. They typically run in the background instead, doing things that people do not see. The programs that you likely work with most are more graphical. They open up windows and you can interact with them through mouse clicks as well as typing.