POP may refer to any of the following: 1. Short for Post Office Protocol, POP or POP mail is one of the most commonly used protocols used to receive e-mail on many e-mail clients. There are two different versions of POP: POP2 and POP3. POP2 was an early standard of POP that was only capable of receiving e-mail and required SMTP to send e-mail.
Zach Herron a 16 year old emerging pop artist / singer songwriter from Dallas, TX. He is 1/5th of Why Don't We. His vocal styling has been compared to Justin Bieber, Shawn Mendez, and Ed Sheeran to name a few.
Zack Merrick. Zachary Steven Merrick was born on April 21st,1988 (age 28) in Baltimore, Maryland. His parents are Mark and Carla Merrick. He has a sister named Samantha. He has hazel eyes. At the end of ninth grade, Zack joined up with the other members of All Time Low. He is the bassist and back up vocalist, but also can play acoustic guitar.