Monza, Venezia and Empoli were relegated in the 2024-25 edition of Serie A.
The bottom three teams in Serie A at the end of the season are relegated to Serie B, replaced by the top two teams and the play-off winner of the second tier. Serie A recently changed the rules for tiebreakers as well, which apply to both the relegation and title fight. If two teams finish on the same points, it will be decided by a one-off clash instead of going by goal difference or head-to-head.
This actually happened in the 2022/23 season of Serie A, when Hellas Verona and Spezia finished on the same points. The do-or-die clash took place at neutral ground, more specifically at Sassuolo's Mapei Stadium, and Verona prevailed 3-1 after four goals in the first half. The Bentegodi side thus escaped relegation, while Spezia failed to do so.