App design: For example, WeChat is an app. Its design includes WeChat’s logo design, that is, icon design, the design of each user interface, that is, UI design, and the design of operation methods, that is, interaction design. , In addition to design, it may also involve user research, usability testing, etc. The scope is wide, including App prototype design, Icon design, interaction design (press a button, what will it feedback, whether it will pop up a prompt or jump to another interface), UI design (that is, the App interface) and so on.

Icon design: Icon design, for example, the penguin of QQ is its icon. According to the function of the product (such as an App), design an icon that fits the product's positioning. The key is to see this icon and know whether you can use it to chat, take photos, or other things.

UI design: User interface design. For example, when you log in to QQ, a page for entering your account and password appears. The overall design of this page is its UI design. For example, if a company wants to develop a social/photography app, it should design its interface based on the product's positioning, such as a startup page, home page, etc. It can also be the home page of a website, registration page, etc. UI design emphasizes visual effects. , that is, what is the first thing you see.