Omnichannel marketing connects all marketing channels to create a consistent, integrated customer experience, while multichannel marketing uses several channels that may operate independently.
For example, a business using multichannel marketing might run separate campaigns on Google Ads, Facebook, email, and its website. With omnichannel marketing, these channels share customer data and messaging, allowing someone to move from a Facebook ad to the website, receive a follow-up email, and complete a purchase without losing continuity.
The key difference is integration. Multichannel focuses on being present across multiple platforms, whereas omnichannel focuses on connecting those platforms throughout the customer journey.