'Bandwidth' is a term that describes the speed at which data is transmitted and is typically given in bits or megabits per second.
Typically, download bandwidth is not the same as upload. Download is typically faster - most people download more that they download. This type of connection is called ADSL - Asymmetric digital subscriber line, and this line allows both voice calls and data over the same connection, using different frequencies. A webserver might need a dedicated lease line. These are symmetric, allowing for equal upload and download speeds. Webservers need these lines because they upload more than they download. These lines are much more expensive.
The speed of the tyoical broadband connection has increased rapidly over the past ten years. A broadband connection used to be 512 kbps (kilobits per second). In 2016, homes in London can get speeds of 160 Mbps - about 300 times faster, and there is no reason at the moment why this rate of increase should not continue.

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