A "prc" file is just a "container" format - a little like a ZIP file; it can contain any type of data whatsoever. However, any PRC file you find on a modern eBook site is going to be a Mobipocket book. A ".mobi" file is just a renamed ".prc" file; it's not a different format at all.
Until you get your Kindle you can download either Mobipocket Reader for PC or Kindle for PC and read Mobipocket books on that.
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