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COMPUTER MEMORY


                  Computer memory is where data and information are stored. The CPU (central processing
                  unit) gets  data  from memory  to  work on it. Once it  has finished processing,  it  sends the
                  updated data back to memory for storage. There are two types of memory: Primary memory
                  and Secondary memory.



                                                                Memory





                                       Primary                                          Secondary
                                      Memory                                              Memory


                       Primary Memory

                  Primary Memory is the main memory of a computer. CPU can directly access this memory. It

                  is fixed on the motherboard of a computer. Primary memory is further divided into two types:
                  1.  Random Access Memory (RAM)

                  2.  Read-only Memory (ROM)

                  Random Access Memory (RAM)

                  RAM is a temporary  memory.  The information  stored  in this
                  memory is lost when the computer is turned off. That’s why it

                  is also called volatile memory. It stores data and instructions                     RAM
                  given by the user and also the results produced by the computer temporarily.
                  Types of RAM:
                      Static RAM (SRAM): SRAM is a type of memory that holds data without needing to be
                      refreshed. It is fast and used for small amounts of memory.
                        Example: Think of it as a special notepad that always remembers what’s written on it,
                      even if you do not keep checking it.

                      Dynamic RAM (DRAM): DRAM is a common type of memory that needs to be refreshed
                      thousands of times per second to keep the information.
                        Example: Imagine a chalkboard that fades if you don’t keep writing over it to make the
                      writing stay clear.

                                             Read-only Memory (ROM)

                                             Information  stored  in ROM is  permanent  in  nature,  i.e.,  it  holds
                                             the data even if the system is switched off. It holds the instructions
                                             that are required to start a computer. It is also called non-volatile
                            ROM              memory.

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