From NPR.

President Trump has issued a sweeping pardon of his political allies associated with a plot to make false electoral slates that could have potentially interfered with the presidential certification on Jan. 6, 2021. It names Trump campaign attorneys Rudy Giuliani, Kenneth Chesebro, Mark Meadows and John Eastman, as well as dozens of other people who met, often in secret, to sign documents claiming they were legitimate electors in states actually won by Joe Biden.

The pardons are essentially symbolic, as none of the people pardoned have been charged with federal crimes. Some are charged in their individual states but the pardon has no impact on those cases.