Explanation
Omni-channel: An omni-channel solution offers two or more channel experiences to customers, and the customer experience is consistent across channels. The context of the case and customer is used to streamline the experience across apps. For example, a customer starts on a self-service portal but then starts a chat conversation. All the pages that the customer has opened are available to the agent.
By providing multi-channel or omni-channel solutions to your customer, you help guarantee that each customer can interact with your organization by using the option that's best for him or her. When you provide multi-channel or omni-channel solutions, you must also consider the effect on the organization. Although it's important to make sure that customers have a consistent experience when they work with the different channels, it's also important to remember that each channel is different.
Reference:
https://www.globalits.bh/how-customer-service-can-handle-entitlement-channels-in-dynamics-365/