In a general sense, this term describes information-carrying capacity. It can apply to
telephone or
network wiring as well as
system buses,
radio frequency signals, and
monitors. On a more
human level, the term can describe a person's
capacity for dealing with multiple projects ("I'd like to update this
database, but I don't have the bandwidth.").
Bandwidth is most accurately measured in cycles per second, or hertz (Hz), which is the difference between the lowest and highest frequencies transmitted. But it's also common to use bits or bytes per second.