Central Processing Unit (CPU) and Memory

Central Processing Unit (CPU) :- The CPU is the brain of a Computer. It's primary function is to execute programs. The CPU also controls the operation of all other components Such as memory, input and output devices. It performs all the arithmetic and logical calculations in a computer. It reads and executes the program instructions, perform calculations and makes decisions. The CPU is responsible for storing and retrieving information on disks and other media. The main parts of the CPU are -
* Memory - Primary or temporary memory
                      Secondary memory
                      Cache memory
* Arithmetic and logic Unit (ALU)
* Control Unit (CU)


Memory :- Memory is the storage unit of a computer i.e, the purpose of memory is to store both instructions and data. Actually a memory unit is a collection of storage cells together with associated circuits needed to transfer information in and out of storage. The number may be placed or read into the cells. Each cell has a numbered "address" and can store a single number. The information stored in memory may represent practically anything. Letters, numbers, even computer instructions may be placed into memory with equal case. Since the CPU does not differentiate between types of information, it is up to the software to give significance to what the memory sees as nothing but a series of numbers. There are three types of memory-
* Primary/Temporary/Main Memory
* Secondary/Auxiliary Memory
* Cache Memory

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