From MTU LUG wiki
A term describing high-speed internet access. As defined by the Federal Communications Commission (FCC), any connection faster then 200kbps is considered broadband, while the technical definition is any signal with a wide bandwidth (as relating to its radio-frequency properties, regardless of the data transfer rate).
The usual example of broadband internet is via a cable modem or DSL.
In common usage, service provided by Ethernet is considered broadband, although technically, Ethernet uses narrowband signaling.