Glossary term
What is Leader / Follower (also Primary / Replica)?
Leader / Follower stands for also Primary / Replica.
The leader accepts writes; followers copy them. Example: All writes go to the primary; reads can go to replicas.
Learn it properly · System DesignLesson 24: Database Replication: Leader, Follower and BeyondOne database server will eventually die, drown in reads, or be too far from your users. How leader-follower replication works, what replication lag does to real users, why failover is so hard, and how multi-leader and quorum systems handle conflicts.