Cassandra trades joins for linear scalability: data is partitioned across a ring of nodes with tunable consistency. FacebookThe social network founded by Mark Zuckerberg — grew into Meta and reshaped online advertising. built it for inbox search; Netflix, Apple, and Discord later ran it for massive write-heavy workloads. It joined the Apache Incubator in 2009 and graduated as a top-level project in 2010 — a flagship NoSQLDatabase designs beyond traditional tables — documents, key-value, graph, and wide-column stores. option beside MongoDBA document-oriented NoSQL database — stores JSON-like records instead of rigid relational tables. and RedisAn in-memory data store — used for caching, queues, pub/sub, and real-time features..

Cassandra brought FacebookThe social network founded by Mark Zuckerberg — grew into Meta and reshaped online advertising.-scale distributed storage patterns to the open-source world.

It proved wide-column NoSQLDatabase designs beyond traditional tables — documents, key-value, graph, and wide-column stores. could run in production at billion-row scale with no single point of failure.