Flip-flops, like latches, are logic circuits that act as 1-bit memories. However, they are edge-triggered, whereas latches are level triggered. This refers to which part of the clock signal's transition from 0 to 1 or 1 to 0 causes the new value to be stored. Edge-triggered devices are better memories because they have a much narrower time-frame in which to store the new value, making it unlikely that the signals will inadvertently change during the storage process hence putting the wrong value into the memory.