The document discusses key terms related to adaptive and responsive content and design. It aims to disambiguate terms that are commonly confused and highlight areas of overlap. Responsive design refers to presentation rules that adjust layouts based on device size, while adaptive design sets rules on the server before sending content. Adaptive content contains metadata about how, when and where it should be displayed. The document recommends prioritizing the terms "responsive design", "adaptive content", and "contextual delivery" to provide clarity.