mockups

/ˈmɑkˌʌps/
noun
  1. A model or replica of a product or design, used for testing, demonstration, or evaluation before the final version is made.
    • Before building the full set, the theater crew created a small mockup of the stage.
    • The designer showed us a paper mockup of the new app interface.
    • The team reviewed the website mockup to check the layout and colors.
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