This document provides an overview of wireframing for product design. It discusses who uses wireframes, including designers, developers, product managers, and others. Wireframes are used to communicate the structure, content, hierarchy, functionality, and behavior of a product interface. The document then covers different styles of wireframing, from low to high fidelity. It also discusses tools for both non-digital and digital wireframing. The goal is to help readers better understand how to use wireframing in the product design and development process.