Serial killings refer to a series of two or more murders, typically committed by the same individual, known as a serial killer. These crimes often occur over a period of time, with a cooling-off phase between each murder. Serial killers may have specific patterns or motives, such as psychological gratification or revenge. The investigation of serial killings can be complex, as law enforcement agencies work to connect the crimes through evidence and behavioral analysis. Profiling techniques are often employed to understand the psychological traits of the killer, which can aid in apprehending them and preventing further violence.