Omnichannel marketing is not a term that can be used interchangeably with multichannel marketing. The words sound the same, as Omni means in all ways or places while multi means more than one. However, the two terms describe different marketing strategies and practices.
Multichannel marketing is when a company uses different channels and platforms to interact with their consumers. Omnichannel marketing, on the other hand, is a multichannel sales approach that companies use to provide their consumers with an integrated shopping experience. It is not about getting your consumer to hear your message but to provide a message that is best tailored to your consumer to provide a personalized experience.