Answer Posted / sateesh

idoc:intermediate documentation
the main purpose of IDOC is to maintain the same data in
differenr servers.
BDC: batch data communication
it is used to upload the Flat file(records) into database by
using batch inputmethods(call transaction,session).
* BDC is screen level processing(if any changes occured
during upgration then it will FAILS).
BAPI: it is the advansed concept for BADI .
Bapi is not a screen level processing we can upload the data
by using bapi.
EG: i want uplod materialmaster data by using BAPI.
for that i am using bapi"BAPI_MATERIAL_SAVEDATA".
RFC: Rfc is used to communicate sap system to legasy system.
by using rfc we can create destination(tcode: SM59).
*we can create RFC then put into a Business
Object(tcode:swo1) then it is converted as BAPI.

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