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.
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 four main functions of a computer are ::
1. Input,
2. Processing,
3. Output and
4. Storage
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