The cybersecurity environment is complex and can be confusing even to experts. The Cyber Defense Matrix is a model that simplifies this landscape, enabling us to navigate it more easily and clearly communicate our plans to others. This presentation will explain the Matrix and how it can be used to build, manage, and operate a security program. By organizing technologies, skillsets, and processes against the Matrix, we can understand the problems we need to solve, what gaps exist, and what options are available to close those gaps.