[Python] What is the meaning of the "[0]" in cmds.circle()[0]?

I am a beginner in Autodesk Maya scripting in Python. I would like to ask as in the title why commands like cmds.circle or cmds.polycube have a "[0]" at the end when assigning it to a variable?

For example:

cube = cmds.polycube()[0]
circle = cmds.circle()[0]


It might be a basic question, but I would like to know what it means. Thank you!

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