Reseller Hosting is a type of hosting where a small or medium-sized business offers hosting solutions to its customers without actually owning any server hardware. Instead, server resources are rented from a full-fledged web hosting company. Those resources are then re-packaged, re-branded and re-rented.
Hosting Resellers can buy a Reseller Hosting plan/account from a web hosting provider and then resell those plans for a profit.