All 7 Redis vs Memcached questions
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What are the fundamental differences between Redis and Memcached as caching solutions? Does Memcached support data persistence the way Redis does with RDB and AOF? How do the threading models of Redis and Memcached differ, and what performance implications does this have? If a team is already using Memcached and considering a migration to Redis, what migration considerations and challenges should they plan for? How would you decide between Redis and Memcached for a large scale application with a purely simple, high volume string caching requirement and no need for advanced features? How does memory efficiency compare between Redis and Memcached for storing large numbers of small key value pairs?
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What features does Redis offer that have no direct equivalent in Memcached, and how might these influence a technology choice?

Intermediate

Answer

Redis offers rich data structures like sorted sets and streams, Pub/Sub messaging, Lua scripting for atomic multi step operations, built-in replication and clustering for high availability and scaling, and geospatial commands, none of which Memcached provides, making Redis the natural choice whenever your application needs more than simple key value caching.
-- Features unique to Redis with no Memcached equivalent
ZADD leaderboard 100 'player1'
PUBLISH channel 'message'
GEOADD locations -122.4 37.7 'sf'
Real-world example A team initially using Memcached for simple caching eventually migrates to Redis once they need a leaderboard feature, a real time notification system, and geospatial search, all capabilities Memcached simply does not provide.

Common follow-ups: How difficult is it typically to migrate from Memcached to Redis for an existing application?;Are there any features Memcached offers that Redis does not?

Sets & Sorted Sets in Redis;Streams
All 7 Redis vs Memcached questions