What You See Is What You Get — an acronym for interfaces allowing user input rendered similarly to the final output.
The "Product" is the website, service, application, or interactive thing being worked on. Similar to UX Design, combining multiple design disciplines.
Low-fidelity visual schematics conveying basic structure and behaviour without detailed interface or visual design.
A draft representation testing ideas for layout, behaviour, and flow before full production deployment.
A diagrammatic representation showing hierarchical parent-sibling relationships between website pages.