bandwidth 
This term describes data-carrying capacity--in other words, how much (and how fast) data flows on a given transmission path. It can apply to network connections, system buses, or any "pipe" through which data pours. Bandwidth is commonly measured in bits or bytes per second. Low-bandwidth (dial-up modem) connections include rates of 56Kbps, while high-bandwidth (broadband) connections deliver more information at a much faster speed--making full-screen, full-motion video possible, for example.