An ethical hacker (also known as a white hat) is somebody who understands the nature of exploiting vulnerable systems and has the ability to cause all hell and wreak havoc on systems connected to the internet. Especially with the Internet of Things, EVERYTHING is hackable!
But, instead of the normal “Bring down your website and business!” type of hackers. These hackers are testing for vulnerabilities in their own systems, whether for work or personal projects, or just for fun.
Ethical Hackers break the system and apply or tell you how to apply fixes. Better the good guys than the bad guys taking over your system, right?