A multimodal text conveys meaning th​​rough a combination of two or more modes, for example, a poster conveys meaning through a combination of written language, still image, and spatial design. Each mode has its own specific task and function (Kress, 2010, p. 28) in the meaning making process, and usually carries only a part of the message in a multimodal text. In a picture book, the print and the image both contribute to the overall telling of the story but do so in different ways.

https://www.education.vic.gov.au/school/teachers/teachingresources/discipline/english/literacy/multimodal/Pages/multimodaloverview.aspx