Reseller Hosting companies are also there in the web-hosting business, they are selling their plans under the heading of shared web hosting service or virtual hosting service

well, a shared web hosting service or virtual hosting service is a form of web hosting service where more than one instance of the same web server is hosted on a single physical server. This is generally the most economical option for hosting as many people share the overall cost of server maintenance.

I think, general shared hosting will be inappropriate for users who require extensive software development outside what the hosting provider supports.