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A computer 
It is a machine that can be programmed to manipulate symbols. Therefore I thought that because all computers have input , output , processing , software and hardware werebasically the same .However there are four different types of computers each with their special use.
is a computer that performs at or near the currently highest operational rate for computers . They are the largest and the most expensive type of computers in the whole world . Super computers are used where large numbers of mathematical calculations are needed , used for scientific and engineering applications that must handle very large database . They can be used by weather forecasting companies and also in universities that helps scientists to map human genes , and also HIV research .
Main-Frames Computer



Computer Main-Frame Server Source: 
Main-frames computers are the second type of computers .This terms reffers to the cabinet containing the central processor unit . These are found usually large corperations or companies which have been around for longtime .Mainframe can act as servers ,where it provides a central area where people can store software programs , data and information , and it can be accessed by other users within the company (A Server: A server is a computer that serves up information to other computers over a network).
Thirdly, Mini computers are generaly of the size of the same fridge and are therefore smaller than main-frames. One can find them in department stores , factories ,scientific laboritories and banks. They can support thousands of users as networks servers and internet servers for example companies like Econet Wireless and banks like Barclays . Their functions are that they are used as servers for different aspects of the business for mail services , bank tellers and different types of processing in the bank .


Last but not least there are micro-computers . Micro-meaning small , that are micro-computers are small computers often called Desktops , Personal Computers/PC . These are found in many homes and officies also including writting , keeping track of accounts , connecting to the internet , sending and connected to the main-frame , mini-computers or servers where they will access and share information , data and softwares .