The alias is the name associated with a contact, which is displayed in the contact list or in a chat session. It is not necessarily the same as the username of the contact.
Authentication is the process that ensures a Jabber entity is a valid user of the Jabber system or some part of that system.
Availability describes whether a user is available for communication; There are several types: online, away, extended away, do not disturb, and chatty.
Away Status / Away Message
AOL terms for the availability status. These are AOL-specific and should not be used.
A list of users that are banned from interacting with another user
Blocklist / Blocked buddies
AOL terms used for the blacklist. These terms are AOL-specific and should not be used.
Buddy List
"Buddy list" is the AOL term for "contact list". This term is AOL-specific and should not be used.
A one-to-one conversation
Contact List
A list of fellow users, along with their status of availability, so that one may choose whom to chat with.
Direct Connection
AOL-specific term for a peer-to-peer connection. Since this term is AOL-specific, it should not be used.
A many-to-many conversation
Jabber is a set of open XML protocols and technologies for exchanging messages and presence information in close to real time. The first application of Jabber technology is an instant messaging (IM) network that offers functionality similar to legacy IM services such as ICQ, AOL Instant Messenger, MSN Messenger, and Yahoo! Instant Messenger. There are currently tens of thousands of Jabber servers on the Internet, millions of end-users, and a thriving community of open-source and commercial software developers building Jabber technologies. In general, "Jabber" is an adjective -- there is no one thing that you can point to as "Jabber", although there are Jabber protocols, Jabber technologies, Jabber servers, Jabber clients, Jabber users, and a Jabber network.
Jabber Server
The software that connects and communicates with other Jabber clients and servers. All communications for a client are directed to a server and then passed to the client; in addition, user rosters and client preferences are commonly stored on the server.
Peer-to-peer Connection
This type of connection is a connection established directly between two entities on the network; none of the data on such connection is relayed through a third-party server such as Jabber.
The AOL term for username. This term is AOL-specific and should not be used.
Secure Sockets Layer and Transport Layer Security; security methods using cryptography to encode data over the Internet to avoid eavesdropping and tampering. Usually, only the server is authenticated (a key is used to prove its identity).
Universal Plug and Play (UPnP)
A set of networking protocols that are used to allow devices to connect easily to the Internet, or to networks in the home or office
The unique name used to sign in to the Jabber server
Voice over Internet Protocol; routing voice conversations over the Internet