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Random-access memory is a form of computer data storage which stores frequently used program instructions to increase the general speed of a system. A random-access memory device allows data items to be read or written in almost the same amount of time irrespective of the physical location of data inside the memory. it is volatile memory.
If computer is switched off data stored in RAM will be destroyed
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Computer hardware is the collection of physical components that constitute a computer system. Computer hardware is the physical parts or components of a computer are:
1. monitor, 
2.keyboard, 
3.computer data storage,
4. graphic card, 
5.sound card, 
6.motherboard, and so on.
 software is instructions that can be stored and run by hardware.

Hardware is directed by the software to execute any command or instruction. A combination of hardware and software forms a usable computing system.

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In computing, a processor or processing unit is an electronic circuit which performs operations on some external data source, usually memory or some other data stream. The term is frequently used to refer to the central processor (central processing unit) in a system, but typical computer systems (especially SoCs) combine a number of specialised "processors".

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Computer is an electronic device which is capable of receiving information (data) in a particular form and of performing a sequence of operations in accordance with a predetermined but variable set of procedural instructions (program) to produce a result in the form of information or signals.
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