The four main functions of a computer are ::
1. Input,
2. Processing,
3. Output and
4. Storage
In computing, the expansion card or board or accessory card is a printed circuit board that can be inserted into an electrical connector or expansion slot, on a computer motherboard, to add functionality to a computer system via the expansion bus.
The programs which are as permanent as hardware and stored in ROM are known as Firmware.
Data stored in ROM can only be modified slowly, with difficulty, or not at all, so it is mainly used to store firmware (software that is closely tied to specific hardware, and unlikely to need frequent updates) or application software in plug-in cartridges.
A spoofing attack is a situation in which one individual or program effectively disguises or mask as another by falsifying information and thereby gaining up an ill-conceived advantage. It may use for stealing password or IP addresses.
The primary purpose of an operating system is to make the most efficient use of the computer hardware.
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