If you were to keep adding clients to a single Broker, that Broker would, at some point, begin running out of resources such as memory, disk space, or socket connections. A territory enables you to scale a Broker to handle large numbers of clients by spreading the client population across multiple host machines.

For additional flexibility, you can create multiple territories and link them together using gateways. A gateway is a connection that allows specified documents to flow between two territories. For more information about gateways, see Managing Territory Gateways.