It is an element with two ends whose resistance changes with the change of voltage, but when the current is cut off, the resistance remains the same, which gives the element the memory status because it retains the last value of the resistance even after the power outage. This makes the conductor correspond to the neural link in the human brain. Non-volatile memory model A 100-gigabit ROM at one square centimeter is much faster than a hard disk and at 10 times the speed of the DDRAM. Resistance is measured using AC power so that the resistance does not change during the voltage.