Asymmetric Digital Subscriber Line
ADSL stands for Asymmetric Digital Subscriber Line. This refers to the ability to transmit data at a high speed/ bandwidth through copper pairs from the local exchange to nearby street cabinets.
The ADSL is an asymmetric system in the fact that it prioritises downstream data as opposed to upstream data. This makes it a popular system for internet users who want to download things from the internet.
This reflects the nature of most internet users who want to access more information/data from the web than information/data they provide.
This does mean that it could have limiting implications for businesses that require faster upload speeds.