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Answer Posted / Ravi Ranjan Kumar
Broadcast variables in Apache Spark are used for sharing large amounts of read-only data across worker nodes during the computation. They are useful when the same data needs to be accessed by multiple tasks in parallel and the data is too large to fit into the memory of a single node. When a broadcast variable is created, it gets replicated on all the worker nodes, but only one copy of the data is sent to each node. This saves network bandwidth as compared to sending the same data to each task separately.
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