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.
Zachary David Alexander Zac Efron (born October 18, 1987) is an American actor and singer. He began acting professionally in the early 2000s, and rose to prominence in the late 2000s for his leading role in the High School Musical franchise (2006â08).