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What is a DStream (Discretized Stream)?

What is a DStream (Discretized Stream)?
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Discretized Stream is a sequence of Resilient Distributed Databases that represent a stream of data. DStreams can be created from various sources like Apache Kafka, HDFS, and Apache Flume. DStreams have two operations:

Transformations that produce a new DStream.
Output operations that write data to an external system.
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