The document provides an overview of self-defense, including its definition, origins in martial arts, importance, and types. Self-defense is defined as using reasonable force to protect oneself from harm. It is derived from martial arts like judo, karate, and jujitsu. Knowing self-defense is important because it builds confidence, improves physical fitness, teaches personal boundaries, and helps develop discipline and mental toughness. There are two types of self-defense - physical, using physical force against a threat, and mental, having the proper mindset to execute techniques. Mental preparation through visualization is key for self-defense situations.