This document defines hacking and different types of hackers. It explains that hacking refers to unauthorized intrusion into networks, which can be done for profit, protest, or challenge. The effects of hacking include damage, theft of information, and compromised systems. Hackers are categorized as black hats (malicious), white hats (ethical), or grey hats. Common hacking tools and techniques are also outlined, along with penetration testing distributions like Kali Linux.