Comptuters use only two numbers: 0 and 1, which are represented by on or off on a single wire. The RS Flip Flop can't really remember the state of a single wire; it uses two different wires and remembers which one was pressed last.
Here we show the D Flip Flop which is really a bit of digital memory. It has one "D" or Data wire and a "CLK" or clock wire which causes the state of the D wire to be remembered.
Notice that the RS Flip Flop is actually still in there: We actually just added a "NOT D" line from the "D" line and made the clock line necessary for either of those to pass through
Next: Binary and Decimal Numbers
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