Save: protect a lead from entry through the final out — typically up by 3 or fewer with runners on or in a tie-break situation.
Hold: enter with a lead and exit before the final out while preserving it. Setup men's bread and butter.
Koji Uehara collected 95 saves in his Red Sox tenure (21 in 2013); Yuki Matsui posted 9 holds with the Padres in 2024.
Both stats depend on opportunities — bullpen role assignment heavily affects the numbers.