What are Channels?

About

A channel has a name or identifier (e.g., user_signed_up) that supports a single type of message.

Channel may also be referred as:

• topics,
• routing keys,
• event types,
• etc.

All brokers support communication through multiple channels.

Analogy

Channel is a concept borrowed from TV or radio channels where they broadcast their information through an assigned channel.

If the broadcasters (publishers) didn't publish its channel, you (the subscriber) wouldn't be able to tune in.