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This is a basic flip flop circuit. This circuit can remain in one or two possible state for an indefinite time, thereby acting like a storage for a single pulse(bit) of information. The information held is either yes or no,1 or 0,etc.
The characteristics of this single stage are: if the left switch is on the blue light turns off i.e and inverted output and if the right switch is on the yellow light turns off i.e and inverted output, because two stage are feeding I to each other, you will find that one stage output (either blue or yellow LED) will be in the same state (either high or low) as the of the opposite stage. To change change from one set of conditions to the other only requires a change of one of the inputs using a short electrical pulse(1or2)
Starting with the simple circuit just described, flip flop have been used in the design of many counters. However, there are simper ways you can us to accomplish the same job. Combining flip-flop and gate can result in a counter/storage element such as a 4 bit binary ripple counter.
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