Apache Spark Certification Practice Test

The command used to exit PySpark, which is an interactive shell for Apache Spark, is `quit()`. This command is designed to terminate the PySpark session and return control to the command line or terminal from which PySpark was launched.

When using the PySpark shell, it is common to want to close the session after you've completed your work. The `quit()` function is a built-in function available in Python that effectively ends the interactive session neatly.

While options such as `exit()` may also function similarly in some Python environments, they are not the primary command associated with exiting PySpark specifically, which adheres to the more common usage of `quit()`.

The other options like `leave()` and `stop()` are not recognized commands within the context of exiting PySpark, making them ineffective for properly terminating the session. Thus, using `quit()` is the standard and correct method to exit PySpark gracefully.