A website mockup design is a visual guide that gives developers a detailed picture of what the page is meant to look like. A mockup is a static design of a web page or application that features many of its final design elements (but is not functional and not quite as polished).
Mockups can go by many names, like schematics, page blueprints, and wireframes. But regardless of the name your designer chooses to use, what they’re creating is the same. The website mockup design is where your designer will set the themes for the page, create any font and color codes, as well as create any assets that the developers will need when building the actual page. They often include some placeholder data or images where certain pieces of content will be pulled from the live site’s media library.