# Icecast documentation

## Icecast 2.4.2 Docs — Glossary

Source client
  A source client is an external program which is responsible for sending content data to Icecast.
  Some source clients that support Icecast 2 are Oddcast, Ices 2, Ices 0.3 and DarkIce.
Slave server (Relay)
  The slave server in a relay configuration is the server that is pulling the data from the master server. It acts as a listening client to the master server.
Master server (Relay)
  The master server in a relay configuration is the server that has the stream that is being relayed.
Mountpoint
  A mountpoint is a resource on the Icecast server that represents a single broadcast stream. Mountpoints are named similar to files (`/mystream.ogg`, `/mymp3stream`).
  When listeners connect to Icecast, they must specify the mountpoint in the request (i.e. `http://192.168.1.10:8000/mystream.ogg`). Additionally, source clients must specify a mountpoint when they connect as well. Statistics are kept track of by mountpoint. Mountpoints are a fundamental aspect of Icecast 2 and how it is organized.
Fallback mountpoint
  A fallback mountpoint is configured with a parent mountpoint. In the event of the parent mountpoint losing connection with Icecast, Icecast will then move all clients currently connected to the now defunct mountpoint to it’s fallback mountpoint.