The law of torts recognizes certain general defences that allow a defendant to avoid or reduce liability even when the essential elements of a tort have been established. These defences are based on the principle that, in specific circumstances, the defendant's conduct is legally justified or excused. The availability of a particular defence depends on the facts of each case. One of the most important general defences is Volenti non fit injuria, which means "to a willing person, no injury is done." This defence applies when the plaintiff voluntarily and knowingly agrees to take the risk of harm. For this defence to succeed, the consent must be free, voluntary, and based on full knowledge of the nature and extent of the risk. For example, a spectator attending a cricket match accepts the ordinary risks associated with the game, such as being struck by a ball.