I have never understood what these acronyms are. I've been involved with HPC on the applications side for many years and hear these terms pop up now and then. I've read through the wikipedia pages but still do not understand what they mean. Can someone give a very high level overview of what they are and how they relate to HPC?

Specifically, how does it relate to a simple hello world mpi program like this:

http://mpitutorial.com/tutorials/mpi-hello-world/

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