Final answer:
Bandwidth is commonly measured in bits per second, indicating the rate of data transfer over a network or communication channel.
Step-by-step explanation:
Bandwidth is often expressed as bits per second. When referring to digital communication systems, bandwidth characterizes the capacity of the channel to transmit information. For example, a wireless router with a bandwidth of 75 Mbps can transmit 75 megabits of data every second. This unit is also used when discussing internet speeds provided by service providers. The term 'per second' indicates the rate at which data is transferred, which implicates division, similar to how velocity is expressed as meters per second (m/s).