A type of hacker referring to someone who looks for ways to bypass computer security. Depending on what actions a hacker does with this ability they are sometimes then as Black Hat or White Hat.
A white hat hacker who finds a secuirty hole would typically report it to the creator of the software to give them a chance to fix it. A black hat hacker who finds a security hole would typically use it to seize control of computer systems, add malicious code, etc.
TakeDown.NET -> “Black-Hat”