The term 'omni-channel' refers to an integrated approach of simultaneously selling to consumers through multiple distribution channels. Omni-channel strategies offer a seamless customer experience across all possible channels, providing a unified experience. On the other hand, 'multi-channel' refers to the use of multiple sales channels independently, without necessarily creating an integrated and cohesive experience. Business-to-consumer (B2C) refers to transactions between businesses and consumers, and e-commerce is the buying and selling of goods and services over the internet, neither of which specifically describe an integrated multi-channel sales approach.