Apache Cassandra is a free and open-source distributed NoSQL database management system.
License: Open Source
Apache Cassandra is a highly scalable NoSQL database suited for distributed data across multiple servers, while Microsoft SQL Server is a relational database management system that provides robust transactional support and ACID compliance. The choice between the two often depends on the specific use case, with Cassandra excelling in high-volume, distributed environments and SQL Server being ideal for applications requiring complex queries and strong consistency.