Self-defence means fighting off something or another person to protect yourself and maybe others. Ways of self-defence includemartial arts or using aweapon. Sometimes, self-defense can cause serious harm to the other person. In most nations, you cannot beprosecuted for this harm. In the United States, an act of self-defence can only count as self-defence if the victim is in a situation that can cause them serious injury or death. Ininternational law all persons have the right to self-defence.[1]
The law of self-defence is the same when you protect others. Generally, you must have a good reason or belief that you needed to defend yourself in self-defence. However, in many places, if the court decides that the defence may have been too extreme, the person may face criminal and civil charges.