Traffic Affect My Hosting?

The topic of hosting involves many different aspects; reliability, customer support, pricing, add-on features, programming, and allowable installation of PHP and other popular marketing scripts.
Today, I'm going to focus on ONE topic, traffic, and the effects it has on your web site's hosting. The simple one word answer here is 'Bandwith'.
By definition, Bandwith is the measurement of data, and the speed at which it flows through the phone lines, cable or DSL lines to tranfer information to and from a web site via your computer.
In relation to your web site hosting, Bandwith measures this flow of data transfer, otherwise termed 'Traffic'. In plain English, it's the number of hits you receive to your site; pure volume multiplied by the file sizes included on your pages.