Hotlinking, which is oftentimes referred to as bandwidth theft as well, refers to linking to images that are on another site. Basically, if you have an Internet site with some images on it, somebody else can also build a website and as opposed to using their own images, they may put links directly to your images. While this might not be such a major issue if you have one small personal Internet site, it can be something very serious if the images are copyrighted, because someone may be aiming to copy your site and trick people. If your website hosting plan has a limited monthly bandwidth quota, you will exhaust your resources without getting real visitors, simply because the traffic shall be consumed by the other website. That is why you need to think about shielding your content from being hotlinked - not simply images, but also documents, as in rare occasions other types of files are linked too.