What is Chat messages?

In my account settings → Notifications
There is an option called Ignore chat messages.
I couldn’t find out what chat messages are.
I browsed the code and found Chat-Version in the header. But I can’t understand which emails have this in their header.
I thought that it belonged to threads and replied emails, but they didn’t have chat-version in their headers.

The relevant pull request (#5578) references the issue where this functionality was requested and discussed (#3471).

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