DRAM is built as a capacitor and a switch for each bit - the data is stored as a charge on the capacitor. ... There are leakage currents within the system - between the capacitor plates, across the channel of the transistor, etc. This means that the charge stored on the capacitor will, over time, discharge.
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RAM, which stands for random access memory, and ROM, which stands for read-only memory, are both present in your computer. RAM is volatile memory that temporarily stores the files you are working on. ROM is non-volatile memory that permanently stores instructions for your computer. Find out more about RAM.
