Bandwidth is the measurement of the amount of data transmitted over an internet connection in a given time. The majority of web hosting companies will set monthly limits. Some of these hosts will allow overselling which means your site will remain up but you receive a bill for the extra amount used others will simply pull the plug until next month. Bandwidth explained: Bandwidth is the amount of data transfer that you are allowed to have for a hosting package i.e. Let's say you have a web page that is 48KB in size, now each time a user opens your site and goes to that page S/he downloads 48 KB of information on to their computer. If a 100 users view that page one time each then there has been a total of 4800 KB of data transferred from the server on which your files are stored for the computer of users. Size of web Page: 48 KB Number of users who viewed the web page: 100 Total amount of data transferred: 48KB * 100 = 4800 KB

Bandwidth is the term that is used to denote the amount of data that has been transferred from your web space. The amount of bandwidth that you require while choosing a host depends on two factors: The size of your site. The popularity of your site. If your site is not very big and you do not have any audio/video downloads and it's not very popular i.e. not a lot of people visit your site then you do not really require a lot of bandwidth, on a average a web site uses up only 500 MB of bandwidth per month. Or if your site is small but extremely popular then you might have to go for a web hosting package that offers high bandwidth. On the other hand if your web site is huge, providing audio/video downloads, as well as being very popular then you would certainly require a huge amount of bandwidth. Let's say you have a video file that is 150 MB in size and in a single day a 100 visitors download the file. This means that 15 GB of bandwidth will have been used. If you multiply that by 30 days for the month it comes to 450 GB.