A presidential pardon is an act of executive clemency that grants forgiveness for a federal crime. It essentially excuses an individual from serving a sentence or facing other legal consequences for the offense. However, a pardon does not erase the fact that the crime was committed; it simply removes the penalty. Link
Presidential pardon is the same as a royal pardon in a hierarchical system of government. The said presidential pardon can be a political move, and it can be a way to appeal to the people.
But such person granted the pardon would be so much indebted to the president, it is something he will never forget.
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