Generally ADSL connections are most common and use copper lines.
It runs under the ground and usually comes with a home phone. Cable on the other
hand runs on a coaxial cable. Speeds of Cable internet does not vary no matter
how far you are from the source unlike ADSL and DSL internet. ADSL
or Cable internet is mostly preferred in most areas.
ie gigabite ethernet card and adsl is normally used in fast ethernet card where the speed of upload and download is not a essential for a user.