User interfaces (UIs) can be classified into several primary types based on how users interact with the system:

• Graphical User Interfaces (GUIs): Users interact with visual representations such as icons, buttons, and menus on digital screens or control panels.
• Voice-Controlled Interfaces (VUIs): Users interact through spoken voice commands, commonly found in smart assistants.
• Gesture-Based Interfaces: Users engage with digital or virtual spaces through physical bodily motions, such as in virtual reality games.