Genres- Pop Punk

Although not known where the term was first coined, 'Pop Punk' was said to have been developed in the USA, popularised by bands such as the Ramones in the early 1970's and then later popular in the UK.

At the time when punk music got started (late '60s to early '70s), rock music had become very stale; long solos had become the norm and using many different instruments. The "hippie" ideals like peace and love and everybody being nice to everybody else had lost its authenticity. Pop Punk was a rebellion against all that and returned to 3-4 minutes songs with catchy melodies, and a standard verse-chorus-verse-chorus-bridge-verse-chorus structure. That simple song structure came to define not just pop and early rock music, but punk rock music as well.

The music often consisted of pop-like lyrics and melodies with the style, pace and tempo of the music from the punk genre. Since the initial boom, bands such as Blink-182 and Green Day refreshed the popularity in the 90's embedding the genre within the mainstream. The genre was (and still is) well liked by many because essentially, it united two smaller audiences into a single large one.
Nowadays there are several sub-genres of pop punk including, ska-punk, synth-punk and skate-punk being the most popular. 
Here are some mainstream pop-punk bands throughout the three eras of its existence:

Original Pop-Punk bands: (70's-80's)

-The Ramones
-Billy Idol
-Iggy Pop
-The Sex Pistols

Revival Pop-Punk Bands: (90's- early 2000's)

-Blink 182

-Green Day

-Fall Out Boy

-Yellowcard

Modern day Pop-Punk Bands: (2010-Present)

-A Day To Remember

-You Me At Six

-Paramore

-My Chemical Romance

I will be analysing specifically the target audience for this genre in a separate post.