# Concepts

## Broker

The Qpid Broker has one or more Virtual Hosts (independent containers of Queues, Exchanges, etc) sharing a connection, authentication, and access control model via the configured Ports, Authentication Providers, Group providers and Access Control Providers. Keystores and Truststores can be defined on the broker level and linked to Ports configured with an SSL transport. The Broker also provides management plugins to allow configuring and monitoring it.

The following diagram depicts the Broker model:

Broker Model

Broker Model
These concepts will be expanded upon in the forthcoming pages.