Random access memory is called RAM.A random-access memory device allows data items to be read or written.RAM devices often have multiple data and are said to be '8-bit' or '16-bit' devices.It works to connect the data lines to the addressed storage for reading and writing the entry. Random access memory takes the form of integrated.Its normally associated with volatile types of memory circuits.

     Read-Only Memory is called ROM.Its called also Read only memory.Its works like as non-volatile memory.It cant remove from smartphone.Read only memory refers to memory that is hard-wired and discrete circuits can be altered in principle.ROM has come to include memory that is read-only doing normal work to Smartphone.

     Card Slot
     A removable flash memory card is called MicroSD card.But, microSD cards are sometimes referred to as µSD or uSD. Smallest memory card that at 15 mm × 11 mm × 1 mm size.There are adapters that make the microSD card able to fit in devices that have slots for MicroSD card slot. MicroSD cards are sold in many sizes, from 8 MB to 256 GB.

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