'Wireframe' is a fundamental visual guide in interface design, indicating the structure of a website and the relationships between its pages. It's an initial step in the design process, used to arrange content and functionality on a page with user needs and journeys in mind.

Wireframes are created early in the development process to establish the basic structure of a page before adding visual design elements and content. They can range from simple pencil drawings to more complex digital designs using specialized software.