Pop punk is a music genre that blends elements of punk rock and pop music. It typically features catchy melodies, upbeat tempos, and simple chord progressions, making it accessible and appealing to a wide audience. The lyrics often focus on themes of youth, rebellion, and relationships. Emerging in the late 1970s and gaining popularity in the 1990s, bands like Green Day and Blink-182 helped define the sound of pop punk. The genre is characterized by its energetic performances and a DIY ethos, often reflecting the spirit of punk culture while maintaining a more polished, radio-friendly sound.