A finished deck is made up of much more than the boards beneath your feet. Structural framing provides the foundation, while the decking field, picture framing, fascia, skirting, railings, stairs, and other components work together to create the finished structure. Each component serves a different purpose and can influence the materials, layout, appearance, and overall design of the project.

In this guide, we’ll break down the major parts of a deck, explain what each component does, and show how they come together to form a complete deck system. Whether you’re planning a new deck, estimating materials, or simply trying to understand deck terminology, this overview provides a starting point for understanding the anatomy of a deck.