An example of what does and does not constitute entrapment may be shown in this manner. If a car is left open on the street with the keys in the ignition and the motor running and someone comes along steals it that would not be considered entrapment. That is because although the opportunity to steal the car was presented to those passing by it, there was no encouragement to do so.
However, if everything remains the same as above and someone associated with law enforcement stands by the car and starts encouraging someone to steal it, telling them they know where they can get rid of it fast and get top dollar, and giving them the address of the chop shop, then that would be entrapment.
In the first example, the person is left on his or her own to make their decision, and in the second, the decision to steal the car is pointed out, encouraged, and enabled by law enforcement.