•purpose is to retrieve, interpret, and dirct the execution of software instructions provided to the computer.
•The most common components of processing hardware are the central processing unit and main memory•
CPU is the brain of the computer
•It reads and interprets software instructions and coordinates the processing activities that must take place
•The design of CPU affects the processing power and the speed of the computer, as well as the amount of main memory it can use effectively
•With a well designed CPU the computer can perform highly sophisticated tasks in a very short time
•Main memory ( also called internal memory, primary storage or just memory) can be thought of as an electronic desktop
•The more desk surface you have in front of you the more you can place on it
•Similarly if your computer has a lot of memory you can place more software instructions in it
•The amount of memory available determines whether you can run simple or sophisticated software
•A large memory is more capable of holding the thousands of instructions that are contained in the more sophisticated software programs
•Large memory allows to work with and manipulate great amount of data and information at one time
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