Immersive media aims to increase realism. It describes the technical tools that content creators have at their disposal to better convey their artistic intent and immerse the audience in the narrative. However, that’s the content. Reproducing this intent in the home is the job of the immersive experience designer, a cornerstone of which is immersive audio design. This white paper supports CEDIA/CTA-RP22 Immersive Audio Design Recommended Practice by exploring the origins and development of immersive audio, clarifying some of the terminology and what the “x.y.z” syntax means, and how to interpret and use it in describing the spatial resolution of immersive audio systems.