Redis ni hifadhi ya data ya in-memory iliyoboreshwa kwa kasi na matumizi maalum, ilhali database za kawaida (SQL kama PostgreSQL, au NoSQL kama MongoDB) kwa kawaida ni mifumo inayotegemea disk kwa uhifadhi wa data wa kudumu, wa msingi. Hutumikia majukumu tofauti na mara nyingi hutumika pamoja.
Tofauti ya msingi: in-memory dhidi ya disk
REDIS → data primarily in RAM (memory) → EXTREMELY fast (sub-ms),
but memory is limited and more expensive than disk
Traditional DB → data on DISK → durable, large capacity, but slower access
→ Redis trades capacity/durability for raw speed.
