The `getActiveSession` method in `pyspark.sql.SparkSession` is used to retrieve the currently active SparkSession. A SparkSession is the entry point for any functionality to access various Spark features and provides a way to interact with different Spark data sources. The `getActiveSession` method returns the active SparkSession if one exists, otherwise it returns None. This method is useful in scenarios where multiple SparkSessions are created and the application needs to retrieve the currently active one.
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