Lightning Aura Components Developer Guide

What Is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Communicating Across the DOM with Lightning Message Service
Create a Message Channel
Publish on a Message Channel
Subscribe to a Message Channel
Lightning Message Service Limitations
Creating Apps
Styling Apps
Developing Secure Code
Using JavaScript
Working with Salesforce Data
Testing Components with Lightning Testing Service
Debugging
Performance
Reference
PDF

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Communicating Across the DOM with Lightning Message Service

Use Lightning message service to communicate across the DOM—between Aura components, Visualforce pages, and Lightning web components, including components in a utility bar. If you're switching from Salesforce Classic to Lightning Experience, you can now build Lightning web components that can communicate with existing Visualforce pages or Aura components. Lightning message service is available in Lightning Experience only. You can also use Lightning message service to communicate with softphones via Open CTI.

To access Lightning message service in Aura, use the lightning:messageChannel component. A message is a serializable JSON object. Examples of data that you can pass in a message include strings, numbers, booleans, and objects. A message cannot contain functions and symbols. The lightning:messageChannel component is only available in Lightning Experience.