The term overselling means offering resources to clients without having the capability to provide them. In simple words, an Internet hosting service provider may advertise a solution with infinite disk space when, in reality, the user's account will be made on a server with countless other accounts sharing the total space. To ensure that all users have a share, providers often set hidden quotas for each account and basically deceive their customers about the resources they will take advantage of. The key reason to oversell is to get new customers even though providers are aware that a web server can have only so many hard drives. Resellers usually purchase packages with restricted system resources too, so they cannot provide the unlimited plans they advertise.
