'Can any one please explain how these lines of sys.argv are working,

When I pass any variable to command line, it prints that parameter and when I did pass any parameter to command line while executing my python file, it gives me error. I am wondered, When the else statement will be executed.

if sys.argv[1]:
    ProcessPerameter = sys.argv[1]
else: 
    ProcessPerameter = 'Monthly'
print(ProcessPerameter)

I know the my question isn't technical, But I shall be grateful, If anyone can help me out

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'Can any one please explain how these lines of sys.argv are working,

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