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Bandwidth is a measure of frequency range and is typically measured in hertz. Bandwidth is a central concept in many fields, including information theory, radio communications, signal processing, and spectroscopy. Bandwidth is related to channel capacity for information transmission and often the two can be confused. In particular, in common usage "bandwidth" also refers to data (information) transmission rates when communicating over certain media or devices.

In website hosting, bandwidth is the amount of information downloadable from the webserver over a prescribed period of time. In essence, it is the rate [data/time], but the time in this case is not seconds but rather a month or a week. Common connection rate terms such as 56K, broadband, etc. are also bandwidth, but are measured per second. Web hosting companies often quote a monthly bandwidth limit for a website hosting, for example 100 GB/month. If visitors to the website hosting download a total greater than 100 GB in one month, the bandwidth limit will have been exceeded.

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