User interface (UI) elements are the parts we use to build apps or websites. They add interactivity to a user interface, providing touchpoints for the user as they navigate their way around; think buttons, scrollbars, menu items and checkboxes.
What are UX elements?
The five elements of UX design, from abstract to concrete, are strategy, scope, structure, skeleton, and surface. This model was created and defined by designer Jesse James Garrett in The Elements of User Experience.