Write Replica
In plain terms
A replica that can accept write operations.
Going deeper
A write replica handles writes in addition to or instead of a single primary, enabling multi-writer setups for scale or availability. It accepts changes, not just reads.
Under the hood
Multi-writer designs need conflict resolution; contrasts with read-only replicas that only serve reads.
Examples
Multi-master databases, write scaling, conflict resolution, distributed writes.
Think of it like...
Like multiple branch offices able to record transactions, not just read records.