XML-RPC es un protocolo de llamada a procedimiento remoto que usa XML para codificar los datos y HTTP como protocolo de transmisión de mensajes. [1]

A specification and a set of implementations that allow software running on disparate operating systems, running in different environments to make procedure calls via HTTP and XML.

Simple cross-platform distributed computing, based on the standards of the Internet.

XML-RPC is a remote procedure call protocol which uses XML to encode its calls and HTTP as a transport mechanism. [1]