User interface (UI Design) and user experience (UX Design) are both necessary for the success of a website. Without one, the other would fail. Together, you have a great website that brings in users and keeps them interested in what you have to offer. So, what is UI and UX design and what are some examples of them? Think of them as fraternal twins. They are both required in web design, but each has its own personality and a different purpose. Let us dive in!