A more thorough explanation:

Definition: Self-defense is when someone uses force to protect themselves from being hurt by someone else. It is considered a legal defense in situations where force is used to prevent harm, such as in cases of assault, battery, or murder.

Examples:

• If someone tries to attack you on the street, you can use self-defense to protect yourself by fighting back or running away.
• If someone breaks into your home and threatens you, you can use self-defense to protect yourself by using a weapon or calling the police.

These examples illustrate how self-defense can be used in different situations to prevent harm. In both cases, the person is using force to protect themselves from an attempted injury by another person. However, it is important to note that self-defense must be justified and reasonable in order to be considered a legal defense.