Question

what is bandwidth

Answer 1

From dictionary.com (pertaining to digital technology): the transmission capacity of an electronic communications device or system; the speed of data transfer: a high-bandwidth Internet connection.

Or as some might say, the fatter your pipe to the 'net, the better.

Answer 2

Bandwidth is the difference between the upper and lower frequencies in a continuous set of frequencies
In computing If band width is high, information carried will be high. Its means the time for data transfer will be low.