Logic gates are not recursive i.e. you typically don't feed a gate's output back to its input. Gates are asynchronous and stateless; their outputs only change w

Logic gates are not recursive i.e. you typically don't feed a gate's output back to its input. Gates are asynchronous and stateless; their outputs only change when their inputs change and they don't retain information. But if you do feed gate outputs back to their inputs (usually indirectly), then it's a recursive circuit and now it can remember state. This is called a flip-flop, or single-bit memory. https://en.m.wikipedia.org/wiki/Flip-flop_(electronics) https://en.m.wikipedia.org/wiki/Flip-flop_(electronics)