The monthly traffic feature, that is sometimes also called bandwidth or info transfer, identifies the full amount of info which can be uploaded to your web hosting account and downloaded from it monthly. The traffic is produced mainly by site visits - every time somebody finds your site, the webpages they see are downloaded from your hosting server to his or her computer system or smartphone and they're shown by the browser. What counts towards the web site traffic generated is the overall size of these pages, so the more site visitors you get for a given period of time, the more website traffic will be generated. In addition to the site visits, file uploads will also be counted towards the total monthly transfer i.e. when you upload web site content or other files using a file manager or an FTP software, they'll also generate some traffic. The counter resets on day one of each month and it is not related to the date you've subscribed or the date you've renewed the web hosting package.