👉 Cassandra is a popular open-source database management system (DBMS) developed by Apache Cassandra. It's designed to be highly scalable and fault-tolerant, allowing for the storage of billions of records in a single data center. The core concept of Cassandra is its distributed architecture where all nodes are connected to each other through a network that spans multiple locations. This allows for high availability and scalability, as each node can handle a large number of transactions simultaneously without requiring any central management or coordination. C