Messages is an application for communicating among specific users.
For example, you can write an agenda and information in the body of the message and exchange opinions in the comment field.
By using the respond feature, you can make a quick response to the message content or any comments.
Users can show their intension by clicking a link such as "Like" and "Acknowledged" without posting any comment.
This respond feature may not be available on the messages depending on the settings by the system administrator.
For details on the respond function, see Working with Respond Feature.