Is think about a light bulb. It is either own or it is off. This is the relevant piece of information about the light bulb that changes quickly between one state or the other. And if you knew Morse code, you could send information to another person using your light just by switching it on and off.
Computer memory is made up of a ridiculously large number of switches that work exactly the same way a light bulb does. These switches are in one state or the other state, and they can constantly switch between the 2 very quickly and easily.
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