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Difference between concurrency and simultaneous?

Now I am studying parallel computing and algorithms. I am a little confused in terms of concurrent executionand simultaneous execution.

What is the difference between these terms? When should we use concurrent, and when should we use simultaneousin parallel computing?

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Simultaneous execution is the use of several resources (cores, HW threads, etc.) to simultaneously perform several tasks. Tasks should not interact in any way; you can have two different applications running on two different kernels, for example.
We can say that the art of designing a system for the simultaneous execution of several tasks deals with simultaneous execution. Hyper-threading, for example. also called "SMT" - simultaneous multithreading, since it is related to the ability to simultaneously launch two threads with their full context on the same core (this is the Intels approach, AMD has a slightly different solution, see the Difference between Intel and AMD multithreading )

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