Wireframing is the process of generating a hand or otherwise drawn, non-artistic representation of page layout and location of functional user operations therein. Wireframes can be drawn on paper, on a white-board, or electronically generated by commercially available software programs.
Regardless as to how you make a wireframe, it should highlight the functions of each page element, such as lists, buttons, and dropdown boxes. The way these page elements relate and interact with one another is also established. The functions from the User Requirements are listed next to the associated page element.
In short, a wireframe is a visual guide, page schematic or screen blueprint which can help you see what is on a page and how the elements work together.