Diff Between Interface and Conversion

Question:
Would you please tell me what is the difference between Interface and Conversion.give me an example in what scinario we need to go for Interface.
Answer:
As far as I know:
Interface is something to connect two system on regular basis. And conversion can be a program used only for a short period of time to bring or update the data and then forget it.
So, those are just words.
_________________
ilya
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