eli5: why do upload and download speeds vary so wildly? isn’t the exchange data happening through all the same means?

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So I’m having a weekend away in a caravan by the sea, so I obviously have a poor data signal. I ran a test and my download speed was about 0.3, while my upload speed was a (relatively)impressive 3.5.

This got me thinking: Why the difference? How the difference? My understanding is that the data is traveling the same way through both uploads and downloads, so why are they measured differently?

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