In the hosting world, overselling means advertising attributes which a client will pay for, but can’t really take advantage of. Some of the attributes of a given web hosting plan can belong to this category - hard disk storage, traffic, database storage space, and so on. A plan could come with limitless disk space, for instance, but the majority of hosting service providers create accounts on just a single server that can have only so many hard drives and considering the fact that all customers upload content, there'll be no space left on the server sooner or later or there will be some hidden quotas so as to guarantee that each user has their own share, regardless that everyone has paid for unrestricted space. As most web hosting Control Panels are meant to work on a single server, a large number of service providers don't have a choice but to oversell, which is nothing else but deceiving their clients.