Supercomputing is primarily scientific computing, usually modelling real systems in nature. Render farms are collections of computers that work together to render animations and special effects. Work that previously required supercomputers can be done with the equivalent of a render farm. Mainframes used to be the primary form of computer.
Mainframes are large centralized computers.
At one time they provided the bulk of business computing through time sharing . When mainframes were in widespread use, there was also a class of computers known as minicomputers which were smaller, less expensive versions of mainframes for businesses that couldn't afford true mainframes. Servers are also sometimes used as mainframe replacements. Desktop operating systems are used for personal computers . Workstations are more powerful versions of personal computers.