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COMPUTER SYSTEM OVERVIEW: BASIC ELEMENTS OF A COMPUTER: A computer consists of processor, memory, I/O components and system bus. i) Processor: It Controls the operation of the computer and performs its data processing functions. When there is only one processor, it is often referred to as the central processing unit. ii) Main memory: It Stores data and programs. This memory is typically volatile; that is, when the computer is shut down, the contents of the memory are lost. Main memory is also referred to as real memory or primary