Reseller web hosting is an option that involves one company (a hosting provider) renting hard drive space and bandwidth to another company (small-mid size business), who then rents the space to third parties (entrepreneurs-small business). Simply put, reseller hosting is the ability to provide hosting to your own clients as if you yourself were the web hosting company. This is typical for entrepreneurs who want to start their own web hosting firm or for current web developers and designers who desire to add additional services to their brand.
Price is definitely the biggest advantage of reseller hosting. A lot of the reseller hosting plans are relatively cheap, perhaps a few dollars a month.