What does the command 'import pytz' do in Python?

The command 'import pytz' is a directive in Python that allows the user to incorporate the functionalities of the pytz package into their code. This package is essential for working with time zones, facilitating the manipulation of datetime objects with respect to various time zones around the world.

When you execute 'import pytz', you are essentially making the entire library available within your current Python script, which means you can later call its functions and classes to manage time zone-related tasks, such as converting times between different time zones or handling daylight saving time adjustments.

The other options do not accurately describe the command's functionality. The command does not install the package; that would require a tool like pip. It also does not create a timezone directly; rather, it provides tools to work with different time zones, and it does not authenticate usage of the package as part of its execution. Thus, the correct choice reflects the primary action of importing the package for use in the program.