What does it mean that a GUI app downloads something "synchronously"?

[anohren]

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The readme lists "up to 32 videos can be downloaded synchronously". I wonder what, more exactly, it means that a video is downloaded "synchronously", from the perspective of an average user? I assume the list of features is targeted toward the average user.

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[StefanLobbenmeier]

it means in parallel, I suspect its a bad translation german english (or similar), german "synchron" can mean either in parallel or in sync