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    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 given by the user                  RAM
                      and also the results produced by the computer temporarily.

                      Types of RAM:
                      1.  Dynamic RAM (DRAM): It requires continuous power to regularly refresh the data stored.

                      2.  Static RAM (SRAM): It also requires constant power to hold on to data, but it doesn’t need to
                         be continually refreshed the way DRAM does.
                      However, SRAM is significantly faster and uses less power than DRAM.

                      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 starting instructions that
                      are required to start a computer. It is also called non-volatile memory.

                                                                                                      ROM
                           Secondary Memory

                      This memory is permanent in nature and is not directly accessed by the CPU. It allows users to
                      store data that may be easily retrieved. It is cheaper as compared to primary memory.

                      Secondary memory devices are also called secondary storage devices. They are categorised into
                      three types: Magnetic disk, Optical disc and Flash drive.

                                                           Secondary Memory

                              Magnetic Disk                     Optical Disc                    Flash Drive

                                Hard Disk          CD     DVD        Blu-ray Disc       Pen Drive     Memory Card

                      Magnetic Disk

                      A device, covered with a magnetic coating is called a magnetic disk. You can record and erase
                      data on a magnetic disk any number of times.

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