There's an analogy here:
Just like vehicles need some type of road to get from point A to B, applications such as the Web, Email, FTP, etc, need an adequate network infrastructure.
Dial-up accounts, which make up the majority of connections, would correspond to the rough dirt paths that were adequate in the horse-and-buggy days of yore, while a fully developed broadband system would be the flat, smooth Interstate Highway system [but without the radar cops :) ]
With vehicles, there was a relationship between the road and cars:
Better roads created demand for faster cars, which would then exceed the capacity of the road, creating the need for better highways. Rinse, Lather, Repeat.
[ Parent ]