All 7 Redis Replication questions
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How do you configure a Redis instance to become a replica of another Redis instance? What is replication lag, and what factors can cause a replica to fall noticeably behind its primary server? What is the difference between full resynchronization and partial resynchronization when a replica reconnects to its primary after a temporary disconnection? How do you check the current replication status and role of a specific Redis instance, whether it is acting as a primary or a replica? How would you design a read scaling strategy using multiple Redis replicas for an application with a very read heavy workload? What happens to a Redis Cluster's replicas during a failover event, and how does the cluster decide which replica gets promoted?
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What is Redis replication, and how does it help improve availability and read scalability?

Beginner

Answer

Redis replication lets you create one or more replica servers that maintain a continuously synchronized copy of a primary server's data, providing a backup that can take over if the primary fails, and also letting you distribute read traffic across the replicas to reduce load on the primary server.
-- On the replica server
REPLICAOF primary_host 6379
Real-world example A busy application directs its read heavy reporting queries to a replica server while all writes go to the primary, reducing the load on the primary server and improving overall responsiveness.

Common follow-ups: Can replicas accept write operations directly?;How much delay is typical between a write on the primary and it appearing on a replica?

Redis Sentinel & High Availability;Cluster Sharding & Hash Slots
All 7 Redis Replication questions