Cassandra: Open-Source NoSQL Database for High Availability & Scalability

Cassandra is an open-source distributed NoSQL database management system designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure. It is a columnar database that is highly scalable and fault-tolerant, making it ideal for use in mission-critical applications where data must be available 24/7. Cassandra is used by many companies, including Netflix, Apple, and eBay, for its ability to handle large amounts of data with high throughput and low latency. It was originally developed by Facebook, and is now maintained by the Apache Software Foundation.