Note: The following is an excerpt from the official Ethereum site. It is provided here as a convenience and is not authoritative. Refer to the original document as the authoritative reference.
Table 1:Data sheet for Remote procedure call specification
This proposal defines a standard set of remote procedure call methods that an Ethereum node should implement.
Abstract
Nodes created by the current generation of Ethereum clients expose inconsistent and incompatible RFC1831 - Remote Procedure Call Protocol Specification Version 2 (RPC) methods because no formal Ethereum RPC specification exists. This proposal standardizes such a specification to provide developers with a predictable Ethereum RPC interface regardless of underlying node implementation.