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Election officials count as many ballots on election night as possible, but election night results are unofficial and never final. Each state has different rules for when mail, provisional, and military and overseas ballots can be counted. For example, some states require all mail ballots to be received by Election Day. Others allow mail ballots to be counted if they are postmarked by Election Day and received by a certain date.
Once all the ballots have been received, the canvass begins. This process usually involves analyzing vote totals to identify and resolve any discrepancies between the number of voters and the number of ballots cast. Most states also conduct audits to further verify the vote totals are accurate.
Once the canvass (and in many states, audits) has been completed, the election results are certified as final. For more information about election results, canvass and certification, see: https://www.eac.gov/election-officials/election-results-canvass-and-certification
Some races or contests may be recounted after the certification process because the contest was close or a candidate or interest group requests it. Recounts differ from audits in that every ballot in a contest or a subset of contests in the election is recounted, and the official results of the election may change as a result.