The sensory or computational mode through which information is expressed or received. Common modalities are visual (still image), audiovisual (moving image with sound), audio (sound only), text (written language), structured data (machine-readable records), code (executable instructions), and three-dimensional (sculptural, architectural, virtual environment). A modality is a property of expression form, not of content meaning — the same idea can be expressed in multiple modalities. The term is distinct from "medium" (which refers to the physical or technological substrate of expression — a vinyl record is a medium, audio is the modality it carries) and from "format" (which refers to the encoding of a particular instance — MP3 is a format, audio is the modality). A multimodal-media system is one that operates across more than one modality at input, output, or both.