They are 1 and 0. In computer terms, 0 means little or no energy, and 1 means significant energy. So 1 is positive values, like true, or on, while 0 is negative values, like false, or off.
Most machines are never truly “off” they just go on standby, which is why their symbol looks like a circle with a vertical line through it. Which sorta defeat the purpose of a binary if you introduce “kinda” but there you have it.
Latest Answers