Bloodstain patterns are the shapes and distributions of blood that result from a violent event, such as an injury or a crime. These patterns can provide important clues about what happened, including the type of weapon used, the position of the victim, and the force of the impact. Forensic experts analyze these patterns to reconstruct the sequence of events. Different types of bloodstain patterns include spatter, pooling, and transfer stains. Each type can indicate specific actions, such as whether the blood was projected from a wound or if it was smeared. Understanding these patterns is crucial in forensic investigations to establish the facts of a case.