What happened was that the classification was improved over since we were young. There used to be either open systems and closed systems. That really was not good enough.
Now we have open systems, a car engine is a perfect example both matter and energy can enter and leave the system.
And we have closed systems. Energy can enter and leave but not matter. For all practical purposes, sorry
@Revoltingest , the Earth is a closed system. Very very small amounts of matter can enter and leave, but they do not really affect the entropy of the Earth very much. But energy enters and leaves regularly. So, energy in and out, but not matter is "closed".
Last there are isolated systems. Neither energy nor matter can enter or leave.