Hacks are clever solutions and shortcuts that allow people to exploit the capabilities of different systems, often in unexpected ways. They can range from technology to everyday life tips.

1. Computer Hacks
2. Life Hacks
3. Physical Hacks
Each type often aims to improve efficiency or add functionality in creative ways.

Ethical hacking is performed to identify vulnerabilities and improve security. Unethical hacking, on the other hand, is aimed at exploiting systems for personal gain.

Notable hackers include Kevin Mitnick, known for his social engineering skills, and Adrian Lamo, known for hacking into Microsoft and The New York Times.