Parallelism vs Concurrency a parallel program exploits real parallel computing resources to run faster while computing the same answer Expectation of genuinely simultaneous execution Deterministic A concurrent program models independent agents that can communicate and synchronize Meaningful on a machine with one processor Non-deterministic A parallel program exploits real parallel computing resources to run faster while computing the same answer. - Expectation of genuinely simultaneous execution - Deterministic  A concurrent program models independent agents that can communicate and synchronize. - Meaningful on a machine with one processor - Non-deterministic