From The New York Times:
President Biden is commuting the sentences of nearly 1,500 people and pardoning 39 convicted of nonviolent crimes, the largest grant of clemency by an American president in a single day, the White House announced in a statement on Thursday.
The commutations affect mostly those who had been released from prison and placed in home confinement during the coronavirus pandemic. The people who received pardons were convicted of nonviolent crimes, including possession of marijuana. A pardon wipes out a conviction, while a commutation leaves the guilty verdict intact but reduces some or all of the punishment.