In computer design, inter-server communication is an extension of the client–server model in which data are exchanged directly between servers. In some fields server-to-server (S2S) is used as an alternative, and the term inter-domain can in some cases be used interchangeably.
Protocols that have inter-server functions as well as the regular client–server communications include the following:
Some of these protocols employ multicast strategies to efficiently deliver information to multiple servers at once.