Pardon vs Commutation - What's The Difference between presidential pardon and commute

After years of saying he was considering the move, President Donald Trump officially commuted the sentence of former Illinois Governor Rod Blagojevich on Tuesday. The decision means that the former governor can be released from federal prison. Blagojevich had originally been sentenced to 14 years in prison and wasn’t set to be released until 2024. The president’s commutation of his sentence eliminates the remainder of the penalty.
Trump also had the option to pardon Blagojevich but opted to simply commute his sentence instead.

But what is the difference between a pardon and a commutation?

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