The interface on the computer, such as the computer version of QQ, WeChat, PS and some button icons on the web page, is called PC-side UI.

2. Mobile user interface design

All interfaces on the mobile phone are mobile UI, such as WeChat chat interface, QQ chat interface, mobile phone desktop, and all icon interfaces seen on the mobile phone can be understood as mobile UI design.

3. User interface design of smart devices

For example, VR interface, AR interface, ATM interface, and some smart device interfaces, such as smart TV and in-vehicle system.

4. Interface in the game field or other games. The scene characters in the game are not UI, and the personal equipment attribute interface is also called game UI design. These are the application fields of UI design.