What is the difference between concurrent programming and parallel programming?

What is the difference between concurrent programming and parallel programing? I asked google but didn’t find anything that helped me to understand that difference. Could you give me an example for both?

For now I found this explanation: http://www.linux-mag.com/id/7411 – but “concurrency is a property of the program” vs “parallel execution is a property of the machine” isn’t enough for me – still I can’t say what is what.

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