A digital subscriber line (DSL) uses existing telephone lines to provide high-speed Internet access. DSL provides this access without tying up the telephone lines, as dial-up Internet access does.
Cable internet vs DSL internet
Compared to the performance of cable Internet service, DSL speeds have historically lagged behind. However, DSL Internet connection speeds are increasing as technology improves and service providers upgrade their network infrastructure.
DSL speeds vary depending on the provider you choose and the packages the provider offers. Even your equipment affects speed. If you are using a wireless router and your computer is far away from the router, you can expect slower speeds. If your router or PC is fairly old, the same thing can happen.
The average DSL internet speed is almost as fast as cable internet connections. However, cable connections are often shared with other users in your area, which slows down the speed. DSL service is not shared with others, so your neighbor's activity will not affect your speed.