What's reseller web hosting and what do I need it for?
Reseller web hosting is specifically interesting for people who want to distribute webspace to third parties. So you rent either a dedicated server from your web host and split it, so you can resell parts of it to your own customers, or you get a licence to even resell a shared webserver – this depends on your web host.
Reselling programs are often used by web agencies, which usually rent their own dedicated server and then use the space for each website/customer they have. As soon as you have enough customers it’s definitely more beneficial than renting a shared server for each customer.
As with dedicated servers you also have the choice to get a managed reseller hosting, so you don’t have to maintain the infrastructure and hardware by yourself.
So in case you run your own business with customers who need webspace in any way, you might take reseller web hosting into account. Go and check if your web host provides it.