Legal cause, often referred to as proximate cause, is a key concept in tort law that establishes a direct link between a defendant's actions and the harm caused to the plaintiff. It helps determine whether the defendant should be held legally responsible for the injury, focusing on whether the harm was a foreseeable result of those actions. Legal cause is essential for establishing liability, as it requires that the injury is not only directly linked but also falls within a scope of foreseeable risks associated with the defendant's conduct.