What is UI?
Also called: User interface, UI design
The short answer
UI, or user interface, is the visible, clickable surface of a website: buttons, type, colour, spacing, icons and the states each element shows.
What people say: “the look”, “the design”.
UI, explained
UI design makes the right action obvious. Consistent components, clear states for hover, focus, disabled and error, and a restrained palette make a page feel trustworthy.
Questions people ask about UI
What is UI?
UI, or user interface, is the visible, clickable surface of a website: buttons, type, colour, spacing, icons and the states each element shows.
Related terms
UX, or user experience, is how it feels to use a website: whether people can find what they came for, understand it and finish what they started without friction.
Design systemA design system is a shared library of reusable components, tokens and rules that keeps every page of a product consistent and faster to build.
TypographyTypography is the choice and arrangement of type, meaning fonts, sizes, weights, line length and spacing, to make text readable and give a site its voice.
Micro-interactionsMicro-interactions are small, single-purpose animations that respond to what a visitor does, like a button that presses in, a heart that fills or a field that shakes on an error.
Part of the Web Encyclopedia by Apex Flow Digital. Definitions are general knowledge, kept current, with no invented statistics.