Personal computer.

There are two main types of personal computers (PC's) : IBM compatible PC's commonly known as PC's and Apple Macintosh PC's know as Machs. The difference between them is the way in which programs, files and operating method are organised for user. There are also some similarities in PC's and Machs. Both of them have a unit which store and process data know as microchips or integrated circuits. Central processing unit (CPU) is a chip which is considered as brain of PC which cam performs any mathematical operations to run program according to calculation to receive, store, and output data. The CPU is such powerful that it can perform more than a billion calculation in a second. Compact disc (CD), Universal Serial Bus (USB's) and other storage devices are the way to inpute data.