Considered as the evolution of multichannel, the omnichannel strategy presupposes the
simultaneous management of marketing channels and integrated contact points between
clients and companies. Studies on the subject are recent, but they attract more and more
academics and retail professionals. Aiming to present the state of the research in
omnichannel, we first identify conceptual differences between multi, cross and omnichannel. Next, we highlight the research contributions made so far on four broad topics: channel integration, physical store role, supply chain management, and consumer behavior. Finally, we point out subjects to be deepened in future studies.