Instant Messaging (IM)
Client-Server model
XMPP / Jabber protocol
XMPP / Jabber server

Concepts bullet Account

What is an account?

An account is usually the combination of a chosen username, for example johndoe, and a certain domain, like, which provides you with a number of Internet/web-based services. These services range from email and photo sharing platforms to blog publishing tools. The person who registered for these services will go through the process of authentication in order to access the resources available.