The following list provides examples of different types of alleged electoral fraud:[1][2]
Ballot stuffing: Casting illegal votes or submitting more than one ballot per voter.
Votes cast in the names of deceased people: The name of a dead person remains on a state's official list of registered voters, and a living person fraudulently casts a ballot in that name.
Felon vote fraud: The casting of a ballot by a person convicted of a felony who is not eligible to vote due to the conviction. Voting rights for convicted felons vary by state.
Voter suppression: Various tactics aimed at lowering or suppressing the number of voters who might otherwise vote in a particular election.
Voter registration fraud: Filling out and submitting a voter registration card for a fictional person or filling out a voter registration card with the name of a natural person without that person's consent and forging their signature on the card.
Voter impersonation: When casting a vote, a person claims to be someone else.
Vote-buying: Agreements between voters and others to buy and sell votes, such as a candidate paying voters to vote for them.
Fraud by election officials: Manipulation of ballots by officials administering the election, such as tossing out ballots or casting ballots in voters' names.
Absentee ballot vote fraud: A person attempts to fill out and turn in an absentee ballot containing false information. For example, this can occur when a person tries to fill out and turn in an absentee vote with the name of an incorrect or non-existent voter. The term can extend to manipulation, deception, or intimidation of absentee voters. (Source: Ballotopedia)