This document provides an overview and comparison of omni-channel and multi-channel retailing. It defines retailing and the key concepts of omni-channel and multi-channel approaches. The main differences are that omni-channel fully integrates channels while allowing seamless customer experiences and information across all channels, whereas multi-channel treats channels as separate silos. The document discusses advantages such as improved customer experience and perception for omni-channel, and disadvantages including upfront investment and flexibility. It concludes that e-commerce platforms will continue innovating to bridge online and in-store capabilities for customers.