Does prompting in Vista for Admin add security?

STI2011

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Nov 2, 2010
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Is Vista's system of prompting you everytime you attempt to do something admin-like mainly so that the user is less likely to screw up thier system? or does this actually help deter a potential hijacker from gaining control of OS?

I heard in Linux you need to log on as root and enter a password everytime you make system changes. But Vista doesnt ask for a password everytime, just a mouse click.

Can anyone help me to understand what Microsoft is trying to accomplish here or how this system works?

You can be as technical in your answer as you need to be...