External computer components connect to a computer system from OUTSIDE. They are not necessary for the system to function but make our experiences easier or better. We will discuss the following:
* Input Devices (used to get data into a computer)*Output Devices (used to get information out of a computer)
* Peripherals
Input Devices
Input devices are pieces of hardware that get raw data into the computer ready for processing.
Processing involves taking raw data and turning it into more useful information.
Input devices fall into two categories:
* Manual Input Devices - Need to be operated by a human to input information
* Automatic Input Devices - Can input information on their own.
* Output Devices
When inputted raw data has been processed it becomes usable information. Output devices are pieces of hardware that send this usable information out of the computer.
Some output devices send information out temporarily and some send information out permanently:
* Temporary Output Devices
* Permanent Output Devices
*Peripheral Devices
Almost all input and output devices are known as 'Peripheral devices'.
These are 'non-essential' hardware components that usually connect to the system externally.
Peripherals are called non-essential because the system can operate without them.
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