to answer your question
Both DSL and cable are broadband. So, they are both much, much faster than ordinary dialup connections, though in general cable is faster.
Both require the use of an external modem. In the case of DSL, an ordinary phone line is plugged into the modem, and then a cat-5 cable goes from the modem into your pc's ethernet card (NIC). In the case of cable, a cable cord comes into the house and into the cable modem, then a cat-5 cable goes to your pc's NIC once again.
To sum that up... both require an external modem and NIC's for your pc. If you are not doing anything bandwidth intensive, like downloading large files, I would go with the cheaper which is usually DSL.
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