Its brilliant, It tests all of your ports (hacker attack points) to see wheter there visible? or wether a hacker can penetrate them (analy) with ease. It dosn't mean your 100% secure if it says your okay but for the average joe its peace of mind. not to sketch you out but your never 100% secure there is always new software with more bugs and hole and hackers will always well, hack peace out dudes.