Redis (REmote DIctionary Server) je open-source, in-memory pohrana podataka — čuva podatke u RAM-u za izuzetno brz pristup. Koristi se kao cache, baza podataka, message broker i mnogo toga drugo, cijenjen po svojoj brzini (operacije ispod milisekunde) i raznovrsnim strukturama podataka.
In-memory = veoma brzo
Redis stores data in RAM (memory), not on disk → access is EXTREMELY fast
(sub-millisecond) because RAM is orders of magnitude faster than disk.
→ This speed is Redis's defining characteristic and the reason it's so popular.
(It can persist to disk too, but data primarily lives in memory.)
