Wireframes are created for every web design. After the ideation and discovery phase (understanding the requirements and the type of design direction you are looking for), a concept is created as a wireframe. The purpose of the wireframe is define functional layout and to demonstrate placement and location of items and content to help you visualize what your website will look like. There may be several iterations, and development will not begin until you give the final approval.
(Click on image below to expand)