A Wireframe is an important visualization technique for presenting proposed functions, structure and content of a web page.

A wireframe separates the graphic elements of a web page from the functional elements, to visualize and explain how users will interact with the web page.

Wirify is a bookmarklet that lets you convert any web page into a wireframe in one click. It converts all of the elements on a web page to gray boxes, so you can visualize the page as a schematic without content.