A write-in campaign refers to a political strategy where voters cast their votes for a candidate by physically writing the candidate's name on the ballot rather than selecting a name from the list of officially printed candidates. In such campaigns, the candidate's name is not preprinted on the ballot, and voters must manually write it in. Write-in campaigns are often used when a candidate is not officially listed on the ballot or as a way for supporters to express their preference for a specific individual, even if that person is not running as an official candidate.