ADSL : Asymmetric Digital Subscriber Line  is a form of DSL.

In the UK all broadband lines use BT’s copper line infrastructure. ADSL is resold by various resellers.

Critical points in choosing an ADSL broadband line include :

1 - Bandwidth ( meassured in mega bits ).
2 - Contention ratio
3 - Latency
4 - Reliability
5 - Guarantees of service ( if any ).