Diátaxis is a systematic approach to technical documentation authoring that identifies four distinct needs and corresponding forms of documentation: tutorials, how-to guides, technical reference, and explanation. It provides a framework for organizing documentation around the structures of these needs. The approach is designed to be lightweight, easy to grasp, and straightforward to apply, and has been successfully adopted in hundreds of documentation projects. Diátaxis aims to help documentation creators and maintainers think effectively about their work and produce high-quality documentation.