A serial killer is a person who commits a series of murders, usually with a cooling-off period between each crime. These individuals often have specific patterns or motives, such as revenge or a desire for power. They may target certain types of victims, making their actions particularly chilling and disturbing. Many serial killers, like Ted Bundy or John Wayne Gacy, have gained notoriety due to their heinous acts and the media coverage surrounding their cases. Understanding the psychology behind these criminals can help law enforcement prevent future crimes and protect potential victims from harm.