TYPES OF COMPUTER

The four basic types of computers are as under:

• Supercomputer.
• Mainframe Computer.
• Minicomputer.
• Microcomputer.

Supercomputers are the fastest and the most expensive computers. These huge computers are used to solve very complex science and engineering problems. Supercomputers get their processing power by taking advantage of parallel processing; they use lots of CPUs at the same time on one problem. A typical supercomputer can do up to ten trillion individual calculations every second.
Example Supercomputers:

Microcontrollers are mini computers that enable the user to store data and execute simple commands and tasks. These single circuit devices have minimal memory and program length but are normally designed to be very good at performing a niche task. Many such systems are known as embedded systems. The computer in your car, for example is an embedded system. A common microcontroller that one might come across is called Arduino.

PC is an abbreviation for a Personal Computer, it is also known as a Microcomputer. Its physical characteristics and low cost are appealing and useful for its users. The capabilities of a personal computer have changed greatly since the introduction of electronic computers. By the early 1970s, people in academic or research institutions had the opportunity for single-person use of a computer system in interactive mode for extended durations, although these systems would still have been too expensive to be owned by a single individual

Servers are a step under supercomputers, because they don't focus on trying to solve one very complex problem, but try to solve many many similar smaller ones. An example of a server would be the computers that Wikipedia stores its encyclopedia on. Those computers have to go and find the page you're looking for and send it to you. In itself it's not a big task, but it becomes a job for a server when the computers have to go and find lots of pages for a lot of people and send them to the right place. Some servers, like the ones Google uses for something like Google Documents, have applications on them instead of just files, like Wikipedia.