A wireframe is a graphical skeleton of a website, that guides the content and concepts of the pages, and helps designers and clients to discuss the details of the website building.The simple wireframe is a kind of low fidelity design, it consists lines, boxes, and grayscale colors. The black-and-white layout can easily present the main information group, draw the outline of the structure and layout, and express the main visual of the user interface.
the wireframe specifies the details of the whole project at the initial stage as the project description. Because it is simple and fast to draw, the wireframe is often used for informal occasions, such as the internal communication. Thus, it cannot be used as the user testing material.