The term overselling refers to offering system resources to clients while lacking the ability to provide them. In simple words, an Internet hosting service provider could advertise a plan with unlimited disk space when, in truth, the client's account will be made on a server with a lot of other accounts sharing the total space. To make sure that all customers have their share, companies often set hidden quotas for every single account and in essence trick their clients about the resources they'll receive. The key reason to oversell is to find new customers despite the fact that service providers are aware that a web server can have only so many disk drives. Resellers often buy plans with limited system resources too, which means that they cannot provide the unlimited plans they advertise.