Batch Data Communication or BDC is a batch interfacing technique that SAP developed.

It is mainly used for uploading data into the SAP R/3 system.

BDC works by simulating the user input from transactional screen via an ABAP program.

The data input data file will come in the form of a flat file which the user save as file type or prn file

from the Microsoft Excel program .

An Abaper will create a program to read the text file and upload into the SAP system.

Normally the tcode SHDB will be used to record the transaction code the user used.

After, the simulation. the Abaper can generate a sample program and modify from here.

It makes the programming easier and faster.