Bloodstain analysis is a forensic technique used to examine the patterns and characteristics of blood at a crime scene. By studying the size, shape, and distribution of bloodstains, experts can determine how the blood was deposited, which can provide insights into the events that occurred during a violent incident. This analysis can help reconstruct the actions of individuals involved, such as the position of the victim and the assailant. It also aids in identifying the type of weapon used and the force applied, making it a crucial tool in criminal investigations and legal proceedings.