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.
This is Zac: he's eight years old from Wales and is the youngest shotokan karate black belt in the country! The first student to become the world's youngest Black Belt in Koo Self Defence in the U.S.A. at age 5, was Joshua Bishop on June 3, 1995.