Clusters are sets of records grouped by a mean. Any mean you want to assign. You can use a Cluster like a Table of the Relational DBMS world, namely to group records of the same type. Or you could want to group records by different logics.
There are two kinds of clusters: Physical and In-memory.The first one is persistent, the second one is volatile.

ID Name Records Conflict Strategy
{{ cluster.id }} {{ cluster.name }} {{ cluster.records }}