Both are from HP, while QC is a test management/defect tracking tool, QTP is a functional testing tool. It is easier in the sense that you can store/run/manage your automated test run from a single place and anyone having access to the QC can run it from anyplace in the world.
There is a lot more about QC, perhaps can't be detailed here, you might want to check the documentation for QC.
There is a lot more about QC, perhaps can't be detailed here, you might want to check the documentation for QC.
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