This document provides an introduction to the study of multimodal argumentation and rhetoric. It discusses how communication increasingly involves multiple modes beyond just language, such as images, sounds, and gestures. While disciplines traditionally focused on individual modes, the field of multimodal argumentation analyzes how modes work together to convey arguments. The introduction outlines different perspectives in the study of argumentation, such as logical, dialectical, and rhetorical, and how a multimodal approach draws from each. It also discusses terminology around visual, multimodal, argumentation, and rhetoric, proposing that "multimodal argumentation" best captures the combination of modes studied in the volume's contributions.