Apache Cassandra

Apache Cassandra is an open-source distributed database built for highly scalable, fault-tolerant data workloads. It stores information in partitioned tables organized by rows, columns, and required primary keys. Data is distributed across multiple machines transparently, and the cluster automatically repartitions when nodes are added or removed. Cassandra Query Language offers an SQL-like interface for defining schemas and performing reads and writes. Its decentralized architecture supports continued availability without relying on a single coordinating server. The system scales horizontally across commodity hardware or cloud infrastructure while maintaining predictable performance. It is suited to applications that need large data volumes, geographic distribution, and resilient operation.