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A wireframe is a mock-up of a website or computer program that doesn’t involve any visual design, used to evaluate how well it functions. Visually, wireframes are generally a series of grey boxes and text; wireframes deliberately avoid colour, photography, or fancy typefaces in order to avoid distractions.

Wireframes can easily be made into prototypes of a website, which allow the user to click around them as if they were real. This makes it easy to evaluate how something actually works without going to the trouble of building it properly – and since you’re dealing only with simple grey squares, it’s easy to make changes if you decide something doesn’t work as well as it could.