Glossary
Concurrence
An opinion by a judge who agrees with the majority's outcome but for different reasons, or wants to add additional reasoning. Concurrences are part of the case but don't always become binding precedent.
A concurring judge agrees that side A wins, but maybe not on the same grounds the majority used. The judge writes separately to explain their own reasoning.
Sometimes a concurrence becomes more important than the majority opinion: particularly when the majority was a plurality (no single rationale got a majority of votes), and the concurring opinion provides the narrowest grounds the multiple judges agreed on.