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In computing, Hazelcast is an open source in-memory data grid based on Java. It is also the name of the company developing the product. The Hazelcast company is funded by venture capital.

In a Hazelcast grid, data is evenly distributed among the nodes of a computer cluster, allowing for horizontal scaling both in terms of available storage space and processing power. Backups are also distributed in a similar fashion to other nodes, based on configuration, thereby protecting against single node failure.