Due to our technical progress and the fact that there is a computer in almost every household, different types of user interfaces have been developed. Command Line Interface (CLI): Command input via command line. Originates from the early days of computers. Computers could not load a graphical user interface. Voice User Interface (VUI): User interface is controlled by voice. Voice assistants such as Alexa, Siri or S-Voice. Voice recognition. Conversion of spoken text. Text User Interface (TUI): application interface via text mode. Installation of operating systems. Setup settings of programs. Max. 256 characters of a character set. Graphical User Interface (GUI): User interface is displayed graphically. Clicks with the mouse on menus or icons perform actions. Many programs in everyday life. Model is the real world: recycle bin = delete data, folder = store data virtually. Natural User Interface (NUI): User interface is as intuitive and natural as possible. The application is carried out by movement, touch or speech. Touchscreens, voice input