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Affordance
What an object or on screen element lets you do, and the visible clues, called signifiers, that tell you so: a raised rectangle with a label affords pressing.
Contrast ratio
A number comparing the lightness of text with the lightness of the background behind it, running from 1 to 1 (identical, invisible) to 21 to 1 (black on white).
Information architecture
The way content in a digital product is grouped, labelled and linked so users can find what they need and always know where they are.
User experience
Everything a person feels and does while using a product, from finding it and learning it to finishing a task and coming back later.
User story
A one line description of something a user needs, written as "As a [type of user], I want [action], so that [benefit]", which names the person, the job and the reason.
Visual hierarchy
The order in which parts of a screen get noticed, set deliberately by size, weight, colour, contrast and position so the most important thing is seen first.
WCAG
The Web Content Accessibility Guidelines, a published set of testable rules for making digital content usable by disabled people, graded at three levels: A, AA and AAA.
Wireframe
A stripped back drawing of a screen in grey boxes and plain labels that shows what goes where and how big it is, with no colour, no photos and no final typeface.