Diff Between InboundInterface and Conversion

Diff Between InboundInterface and Conversion:
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Interface                                     Conversion
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1)Interface will be used to upload the            1)Conversion is one-Time Data Transfer
  data multiple times.
  Regularley every week or month or day

2)Client Will be using Legacy system.     2)Client will use Only ORacle Applications.
  and also Oracle Applications                       once data is uploaed from legacy then legacy
                                 system will be closed.

3)We will not be knowing the Data file  3)here we will be knowing the data file volume
  volume.                                     exactley.
4)In Customization and as well as             4)Normally in the Implementation Porjects we
 implementation projectes we will be              will be using.
  developing Interface.