The word overselling refers to offering system resources to clients without having the capacity to provide them. In simple words, a hosting firm could advertise a solution with infinite disk space when, in reality, the user's account will be created on a server with a lot of other accounts sharing the total space. To ensure that all of the customers have their share, companies often set hidden quotas for every single account and thus trick their customers about the resources they will receive. The main reason to oversell is to find new customers even though service providers are aware that a web server can have only so many hard drives. Resellers usually buy packages with fixed system resources too, therefore they are not able to provide the unlimited plans they offer.
