Questions
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1Explain Redis's single-threaded model. Why is it fast despite being single-threaded, and how has this changed in Redis 6+?
2What changed in Redis 6 regarding threading?
3What is the Redis event loop? What library powers it?
4What is the difference between redis-server and redis-cli?
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Explain Redis's single-threaded model. Why is it fast despite being single-threaded, and how has this changed in Redis 6+?

Redis processes commands in a single thread, avoiding lock contention. Speed comes from in-memory ops and efficient I/O multiplexing (epoll/kqueue). Redis 6 introduced threaded I/O for reading/writing network data, while command execution stays single-threaded. Redis 7.4 adds async I/O improvements.