Self-defense is the legal right to protect oneself from physical harm. It allows individuals to use reasonable force to defend against an imminent threat or attack. The level of force used must be proportional to the threat faced, meaning that excessive force may not be justified. In many jurisdictions, self-defense laws vary, but they generally require that the person perceives a genuine threat. This concept is often discussed in relation to personal safety, martial arts, and legal cases involving violence. Understanding the principles of self-defense can help individuals make informed decisions in dangerous situations.