Python: What is the difference between a module and a script?

Module is a file intended for import. Script is a file intended for direct execution.

Module:

1# utils.py
2def helper():
3    return "Help"

1# main.py
2import utils
3print(utils.helper())

Script:

1# script.py
2if __name__ == "__main__":
3    print("Running as script")
4    main()

__name__ == "__main__" — code runs only when file is executed directly, not when imported.