Asymmetric digital subscriber line, shortened to ADSL, is a type of internet connection that uses a home landline to provide broadband.
ADSL allows faster transmission of data through copper telephone lines. It splits the telephone connection so that frequencies not used in a voice telephone call are used for broadband.
This means that the ADSL can be used at the same time as a phone call is made, compared to the early days of dial-up internet connections.
It is the most common form of internet connection in the UK. It provides much higher bandwidth and bit rate for downstream than upstream, meaning download speeds are far quicker than upload speeds.