Bandwidth is the size of the pipe. Bigger the pipe higher the bandwidth.
It’s the difference between a two lane highway and a four lane highway.
Speed is how fast the cars and go on the highway.
If the bandwidth is low (two lanes) it doesn’t matter if the cars in back can go 80 MPH when the cars in front of them are only going 30 MPH.
If the bandwidth is higher (four lanes) then those cars can go 80 MPH because there’s nothing causing congestion.
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