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If I understand you correctly, you are asking what leverage means? It is a measure of how important the plate appearance is, specifically, how much the teams' win probabilities would change based on the outcome. The highest leverage situation would be, say, bottom of the 9th, two outs, home team down 1 with the bases loaded - an out loses the game, a hit wins it. The lowest leverage situations would be, well, a blowout, or anytime in the earlier innings when a single at-bat can't really decide the rest of the game. So, the leverage roles are to fine-tune which relievers should pitch in more or less important situations, even within the broad roles of closer, setup, etc.
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