User Interface is the art of putting together letters, words, images, and other things so that the end-user will be able to operate the particular piece of software or program.

This includes but is not limited to menus, buttons, text boxes, images, icons, and any other elements a designer can find to help their users. To succeed in being a graphic designer, one must understand how to create user interfaces properly. 

Another critical role that the designer plays is to layout the appearance of the user interface in such a way that it looks desirable to the users.

Usually, we see many apps with great graphic images, but they do not look very appealing when it comes to the user interface. In short, the overall appearance of the app matters a lot. So a good designer always keeps in mind the overall appearance. 

Online and Offline UI 

UI Designers has two kinds of mode; one is offline, and the other is online user interface designing. In the offline mode, the designer will use many offline tactics to design the app's user interface. He will use templates, colours, icons, Javascript codes and many more things.

But in the online mode, he will use more interactive elements such as live chat support, XML website codes, flash objects, 3D objects, etc. This will give the app an appealing look and make it interactive. 

So we can say that a graphic designer plays a vital role in the success of a web or app. An excellent graphic design can make things like banner printing look beautiful, appealing and interactive. Hence, he deserves all the appreciation that a web user or an app owner can give him.