Essentially and most simply put, plot is what the characters do to deal with the situation they are in. It is a logical sequence of events that grow from an initial incident that alters the status quo of the characters.
“I've always been driven by the concept of equal justice under the law, but only the rich can pay great sums of money for legal assistance and that puts them at an advantage over the poor.”
“One of the ingredients that made Cheers work so well was the great ensemble of actors we had. That's the case with any good series.”