SAP RFC INTRO

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ABAP_RFC - Introduction
Remote Function Call (RFC) is an SAP-specific procedure for calling function modules in remote systems.
Communication using the RFC interface can be divided into different scenarios based on the systems involved:

AS ABAP - AS ABAP

AS ABAP - External system

AS ABAP - SAP Java

AS ABAP - external Java
RFC can be used as a synchronous or asynchronous communication procedure.
There are also different RFC variants that have been designed for different purposes and which therefore have different service properties:

Synchronous RFC (sRFC)

Asynchronous RFC (aRFC)

Parallel RFC (pRFC)

Background RFC (bgRFC)

Transactional RFC (tRFC), obsolete

Queued RFC (qRFC), obsolete
Transactional and Queued RFC were replaced by Background RFC.

More Information

For a detailed description of Remote Function Call, see the documentation RFC in SAP Help Portal.