The Castle Doctrine is a legal principle that allows individuals to use reasonable force, including deadly force, to protect themselves in their own home. This doctrine is based on the idea that a person's home is their sanctuary, and they have the right to defend it against intruders without the duty to retreat. In many jurisdictions, the Castle Doctrine applies not only to homes but also to other places where a person has a legal right to be, such as a vehicle or workplace. Laws regarding the Castle Doctrine can vary significantly by state, so it's important to understand local regulations regarding self-defense.