Whenever some data is uploaded to a shared website hosting account or downloaded from it, web site traffic is produced which is a feature that each hosting plan comes with. It's also among the characteristics you have to take a look at, since what amount of traffic quota you'll need is based on what exactly you need the account for. The website traffic is mainly generated by downloads including site visits. In layman's terms, when somebody visits your website, the web pages are downloaded from the server on their computer and they're subsequently shown by their web browser. It's of course recommendable to be aware that uploads count as well, hence any time you back up large files from your computer system to the server, some web site traffic will be generated as well. Different companies sometimes have different names for this feature, for example traffic, bandwidth, data transfer, still all of them refer to the same thing - the total amount of incoming and outgoing information produced for a period of time.