This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Bandwidth is originally a signal processing term used to describe the size of a frequency band used in communication. eg communication using the frequency range from 1MHz to 2MHz
The size of the band is related to the amount of information that can be transferred on that band, hence large band (more width) means able to transfer more data over a period of time.
This has been taken by the computing world but rather than describe the width of the band, we talk directly about the maximum data rate that the band can sustain eg 1kb/s, 1Mb/s, 1Gb/s, 1Tb/s