You have made a cluster of posting today that all seem as though you are asking interview questions. The tone of the questions combined with the subject matter would lead to this conclusion.
Might I suggest instead that you search the forums and the WIKI as well as the SAP online Help. I believe that you will find your answers to these very basic questions - particularly since each of these topics you posted have an entry in the online help.
I'm am locking these threads.
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