UI design refers to the overall design of human-computer interaction, operational logic and beautiful interface of software, which is collectively called interface design. Interface design is not a simple artistic painting, it needs to locate users, use environment and use methods, and design for end users. It is a purely scientific artistic design. The standard for testing an interface is neither the opinion of the project development team leader nor the result of the project members' voting, but the feeling of the end users. Therefore, interface design should be closely combined with user research, which is a process of constantly designing satisfactory visual effects for end users.

They are inseparable: Zhihu, a sharing platform. From the product point of view, it is the interface that users need to share and create knowledge quickly, and constantly optimize this. Unfortunately, the ios client doesn't do this very well (Android is useless and doesn't express any opinions).

The key to a good product lies in whether the core of the product can meet some needs of its users. Zhihu did it, satisfying the process of knowledge sharing and creation of users. On the other hand, products need to pay attention to details and constantly optimize the experience of the whole product, rather than just building a framework.