These days, most computers also have a Network Connection to retrieve information over a network.

They are all of the ways we interact with the computer.

The Input and Output Devices are simply our screen, keyboard, mouse, microphone, speaker, touchpad, etc.

Examples of secondary memory are disk drives or flash memory (typically found in USB sticks and portable music players). The advantage of the secondary memory is that it can store information even when there is no power to the computer. The Secondary Memory is also used to store information, but it is much slower than the main memory.

But the information stored in the main memory vanishes when the computer is turned off. The main memory is nearly as fast as the CPU. The Main Memory is used to store information that the CPU needs in a hurry.The Central Processing Unit (or CPU) is the part of the computer that is built to be obsessed with “what is next?” If your computer is rated at 3.0 Gigahertz, it means that the CPU will ask “What next?” three billion times per second.The high-level definitions of these parts are as follows: Figure 10: Computer Hardware Architecture

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