Apache Cassandra is an open source NoSQL database. It falls in the Column family based database category. It is developed at Facebook and built on the concepts on Amazon's Dynamo. It is designed to store large amounts of data in a distributed fashion.
Cassandra is highly scalable with no single point of failure. It satisfies availability and partition tolerance categories of the CAP theorem with tunable consistency, that is, Cassandra is by default eventually consistent, however, consistency in Cassandra can be increased at the cost of availability. Cassandra is made to support very high-speed writes and due to its excellent features, it is one of the most widely used databases in the NoSQl World.
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