Concurrency is about *managing* multiple tasks seemingly at the same time, while parallelism is about *executing* multiple tasks simultaneously. A single-core CPU can achieve concurrency, but not true parallelism.
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Early video editing software often relied on expensive, specialized hardware like dedicated editing decks, making it inaccessible to most individuals.
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The original Doom game engine, despite its age, was remarkably efficient at rendering 3D environments using a technique called "binary space partitioning" (BSP) to handle complex scenes, even on the limited hardware of the time.
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