I'm learning XMPP and I repeatedly see the word "Roster" but I have no idea what it is.
A user roster file is an efficient tool for managing users in bulk. You can perform the following tasks for multiple users in bulk by uploading a user roster file into Möbius: Create new users. Enroll users into a class. Update Möbius's existing user information.
As mentioned above, XMPP works by passing small, structured chunks of XML data between endpoints (clients) via intermediary servers. In other words, if you send a message to your friend using XMPP, that message, as part of an XML document, first travels to a server instead of traveling directly to your friend's device.
An XML stanza is a discrete semantic unit of structured information that is sent from one entity to another over an XML stream.
contact list (in XMPP this is called a "roster")
Source: XMPP-IM - RFC 6121 § 1.3: Requirements
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