What is gesture and what does it do? What is the meaning of multimodality? What do these concepts signify within the different theoretical approaches to interaction and communication among human beings? Why do we study gesture and multimodality? The thirteen chapters that make up this volume provide answers to these questions. They bring together an eclectic set of recent studies on visible bodily actions conducted by junior and senior researchers and are a testimony to the curiosity and vitality that have always distinguished gesture studies. This young yet rapidly growing field investigates the semiotic features of gesture in relation to speech as integral parts of utterances, the different uses of gestures with and without speech, such as gestures in language acquisition, gestures in the performing arts (music, dance, theatre) and gestures in Artificial Intelligence.