Answer: Py4j

Py4j is the library used in PySpark to enable Python to dynamically interface with JVM objects (Java Virtual Machine). This integration is crucial for PySpark, as it allows Python code to utilize Apache Spark's distributed computing capabilities, which are written in Scala (a JVM language). Py4j makes it possible for Python applications to interact with Java objects in a JVM, thus bridging the gap between Python and Apache Spark.

Author: LeetQuiz Editorial Team