ADSL
ADSL is an abbreviation for 'Asymmetric Digital Subscriber Line' and provides fast access internet service over existing copper wire telephone links.
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Bandwidth
The capacity of a network connection (your internet connection) to transmit and receive data.
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Broadband
A generic term for high speed digital internet connections. Bandwidth is normally measured in 'bits per second' (b/s).

IP Address
An IP (Internet Protocol) address is a unique number used to locate equipment on a network including the internet. An example of an IP address as it would be commonly written is 62.172.189.189.
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Router
A device that (like a telephone exchange) directs data traffic between two or more networks, such as between the internet (via your ISP) and your home network of one or more computers.