As far as I understand it.. think of the internet as a pipeline whenever you want to load a webpage or download a file you are basically requesting water to be sent to your tap the water being the information only so much information can be sent throw a pipe at a Time this usually isn’t a problem because not everyone is requesting information at the same time so by slowing down how much information you can get everyone gets to use the pipeline
As for why we can all just use it to it’s full potential is because the pipes aren’t big enough
Lol hope this helps
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