The term “Castle Doctrine” is a legal concept that comes from the philosophy that every person is the "king" of their “castle.” As such, no person is required to retreat (Duty to retreat is removed) before using force or deadly force against an intruder in their home (some states include your yard, a place of work, and occupied vehicles).
Stand Your Ground laws provides that people may use deadly force when they reasonably believe it to be necessary to defend against deadly force, great bodily harm, kidnapping, rape, or (in some jurisdictions) robbery, or some other serious crimes
The "Duty to Retreat" is an element in self-defense law that states you have a duty to try to get away from a situation before you escalate to deadly force.
Although some states use a blend of doctrines, self-defense laws generally fall into the following three categories:
In South Carolina, the Castle Doctrine laws are implemented in S.C. Code Ann. § 16-11-440 and include a powerful “presumption of imminent peril or death” to the inhabitants of that castle, even if that person is a visitor in the home. The South Carolina Castle Doctrine law extends to another’s dwelling, residence, occupied vehicle and, while not explicitly stating as such, to another’s business.