In the Internet hosting world, overselling means advertising benefits that a client pays for, but cannot really take advantage of. A lot of the features of a given hosting plan can fall under this category - hard disk storage, traffic, database storage space, etc. A package may come with unlimited disk space, as an illustration, yet almost all hosting service providers generate accounts on just a single server that can have only so many hard disks and considering that all customers upload content, there'll be no space left on the server at some point or there will be some secret quotas to ensure that every single user has their own share, although everyone has paid for unlimited space. As most web hosting Control Panels are intended to work on a single server, many companies don't really have a choice but to oversell, that's nothing else but deceiving their clients.