Cassandra Datacenter and Racks

Apache Cassandra uses the terms "datacenter" and "racks" to describe its architectural elements, which can be abstracted from their physical counterparts. A datacenter in Cassandra is a group of nodes within a cluster for replication purposes, while racks are groups of servers that prevent redundant storage of replicas. The use of snitches helps determine the placement of data within racks and datacenters, ensuring efficient organization and performance.