Many web hosting plans do not come with unlimited bandwidth, which means there is a set limit that determines how much data can be downloaded and uploaded from the web server at any one time. Once this limitation is exceeded, pages will begin to freeze while loading and the site may even crash for hours at a time. Many people don't understand how easy it is to exceed the amount of bandwidth allocated to you, especially if you own a rapidly growing site.
In other words, the amount of traffic that can visit your website at one point in time without decreased site performance is directly related to your bandwidth limitations. Bandwidth restrictions can have a great impact on the progression of a web site, so it is important to make sure you have adequate amounts of bandwidth available to your site before driving web traffic.