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Why is RDD called fundamental data structure of Spark when Dataframes and Datasets don't use RDDs

 
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RDD is called the fundamental data structure of Spark. I have read this on multiple sources including https://sparkbyexamples.com/spark-rdd-tutorial/. We have Dataframes and the Datasets too. Why is RDD called the fundamental datasets when Dataframes and Datasets do not use it. Thanks
 
Monica Shiralkar
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Thats because at the end , everything is decomposed into RDD.
 
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