The main memory is a temporary storage memory. Main memory holds the data to be processed, the program instructions to be executed and the program results waiting to be issued. Both data and programs instruction must be main memory before processing can proceed. Main memory is called the Random Access Memory (RAM). Information data and programs store in RAM are volatile. The information is lost when you switch off computer. The size of a computers main memory is measured in bytes. In simplest terms a byte is the amount of memory required to store one letter or digit.
Secondary Memory
Secondary Memory is one of most important characteristics of today PCs .It is used to store a very large amount of information and data. Typical example of this type of storage are hard disks ,floppy disks and CD ROM’s. When we want to run a certain set program the instruction are copied from the secondary store to the main memory and then the CPU start executing then.
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