Is this an interview question?
I am supposing so, because your question is quite vague and not SAP related at all.
There are millions of ways how data transfer can be done. e.g. floppy disks, remote copy, mailing, web browser, ...
If you are looking for a sensible answer, you will have to explain a bit more what your problem is, e.g. what is the data source, what is the target, what kind of data, what are your business needs, ...
And by the way, there should be a lot of manuals and tutorials out there. May I suggest you learn a few basics first? And ask, when you have got more specific questions.
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