Channels are a way to filter which messages are sent to which endpoint, allowing for more precise control over message delivery. They can be set on endpoints to receive messages from specific channels or groups of recipients, differing from event types in their approach to filtering. To use channels, support must be enabled and customers will see a new Channels section in the Application Portal or API settings. When sending messages, the channels field should be specified. Channels are useful for managing multiple sub-categories or recipients that require different filtering, such as Github webhooks for specific repositories. They unlock new possibilities and use-cases, but may not be suitable for everyone, requiring explicit enablement from the dashboard.