Anytime some info is uploaded to a shared web hosting account or downloaded using it, website traffic is produced which is a component that each hosting plan includes. It's also one of the features you need to take a look at, because what amount of traffic quota you will need is dependent upon what exactly you need the account for. The traffic is mainly generated by downloads including web site visits. Basically, every time someone opens your site, the pages are downloaded from the server on their computer and they are afterwards shown by their web browser. It's of course important to be aware that uploads are considered as well, hence if you back up large files from your pc to the server, some site traffic will be generated as well. Different providers often have different names for this feature, like traffic, bandwidth, data transfer, still all of them refer to the very same thing - the exact amount of incoming and outgoing info produced for a given period of time.