It's difficult to forgive a bad interface design even genius and useful programs. It is clear that in this case, it would be embarrassing to work. So if you work as a programmer or your company has created a definite program, the service design interface for users should be of interest to you.
Interface design is that your program creates the general appearance of the application, including options for the original interfaces, splash screens, visualized in the boot process programs, buttons, illustrations for step-by-step processes and so on. All these elements are executed in the same style.
Creating a nice interface design, you make the program more convenient and attractive. However, the main thing in this process is the professionalism of the designer. Only a highly qualified specialist can bring you a great result.