Bandwidth is simply a measurement of time and data transferred at one point in time. Bandwidth is measured in terms of data per second in the web hosting industry, and the amount offered with each hosting plan differs greatly depending upon the hosting type, plan size, and the provider.
Bandwidth is often used in web hosting to describe how much data a web server can transfer at once, which is a good indicator of the web hosting plan’s ability to accommodate heavy site traffic.
Every visitor that views a page on your web site is consuming a small amount of bandwidth. Plans with more bandwidth will allow for higher amounts of daily traffic because your site will be able to transfer data to more visitors at once.