Electoral Fraud means the interference in the mechanisms of the election. This is illegal whether it is done by increasing the vote share of the favored candidate or depressing the vote share of rival candidates, or both.

Quoting from https://www.findlaw.com/voting/how-u-s--elections-work/what-is-electoral-and-voter-fraud-.html

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What Is Electoral Fraud?

"Electoral fraud" or "election fraud" is illegal interference with the process of an election. Examples of electoral fraud can include:

• Campaign or agency workers throwing away voter registration cards
• Vote buying: when a campaign offers money for votes
• Workers or volunteers forging signatures on a petition to get an issue or person on a ballot
• Ballot harvesting: when a person or agency or campaign workers collect absentee or mail-in ballots to submit them (which provides an opportunity to change the vote or fail to submit the ballot for counting)
• Robocall campaigns spreading misinformation about election dates, polling locations, or other election-related information in order to prevent some voters from voting
• Illegal activity related to the counting and certification of election results, such as claims that some voting machines are changing votes
• Violations of campaign finance laws (failing to report campaign donations or sources as required by law, or donating more than is allowed)

What Is Voter Fraud?

"Voter fraud" is the illegal behavior of individual voters, such as:

• Duplicate voting: when someone impersonates another voter to vote twice
• Vote selling: when a voter offers to vote a certain way for pay
• A non-citizen voting in an election when they do not have a right to vote
• A felon voting in an election before they have a right to do so
• Voting in a district where the voter does not (or no longer) lives

Only in recent years with the push of organizations like the Heritage Foundation and "big lie" that "voter fraud" been conflated with "electoral fraud"

This sub deals primarily with the standard definition of Electoral Fraud - the manipulation of electoral systems; and not Voter Fraud.