Differences between Serial Killer and Mass Killer

* serial killers kill several people over a period of several days, weeks, months and even years. On the other hand mass killers kill several peoples in a matter of hours.

* serial killers commits in several crime scenes but mass killers commit crimes in a single crime scene.

* serial killer has multiple victims in various events but mass killer has various victims in an events.

* serial killers kills in several episodes with very specific methodology on the other hand, mass killers kill in an episode with no specific methodology.

* serial killers kills victims through plans and repeating the process several times where victims came of same nature but mass killer kills victims more spontaneously and kills a wife variety of people generally at once.