Punk rock is a rock music genre that developed between 1974 and 1976 in the United States, the United Kingdom, and Australia. Rooted in garage rock and other forms of what is now known as protopunk music, punk rock bands eschewed the perceived excesses of mainstream 1970s rock. They created fast, hard-edged music, typically with short songs, stripped-down instrumentation, and often political, anti-establishment lyrics. Punk embraces a DIY ethic, with many bands self-producing their recordings and distributing them through informal channels.

By late 1976, bands such as the Ramones, in New York City, and the Sex Pistols and The Clash, in London, were recognized as the vanguard of a new musical movement. The following year saw punk rock spreading around the world, and it became a major cultural phenomenon in the United Kingdom. For the most part, punk took root in local scenes that tended to reject association with the mainstream. An associated punk subculture emerged, expressing youthful rebellion and characterized by distinctive styles of clothing and adornment and a variety of anti-authoritarian ideologies.

Punk rock bands often emulate the bare musical structures and arrangements of 1960s garage rock. Typical punk rock instrumentation includes one or two electric guitars, an electric bass, and a drum kit, along with vocals. Punk rock songs tend to be shorter than those of other popular genresвАФon the Ramones' debut album, for instance, half of the fourteen tracks are under two minutes long. Most early punk rock songs retained a traditional rock 'n' roll verse-chorus form and 4/4 time signature. However, punk rock bands in the movement's second wave and afterward have often broken from this format. In critic Steven Blush's description, "The Sex Pistols were still rock'n'roll...like the craziest version of Chuck Berry. Hardcore was a radical departure from that. It wasn't verse-chorus rock. It dispelled any notion of what songwriting is supposed to be. It's its own form."

Punk rock lyrics are typically frank and confrontational; compared to the lyrics of other popular music genres, they frequently comment on social and political issues. Trend-setting songs such as The Clash's "Career Opportunities" and Chelsea's "Right to Work" deal with unemployment and the grim realities of urban life. Especially in early British punk, a central goal was to outrage and shock the mainstream. The Sex Pistols classics "Anarchy in the U.K." and "God Save the Queen" openly disparage the British political system and social mores. There is also a characteristic strain of anti-sentimental depictions of relationships and sex, exemplified by "Love Comes in Spurts", written by Richard Hell and recorded by him with The Voidoids. Anomie, variously expressed in the poetic terms of Hell's "Blank Generation" and the bluntness of the Ramones' "Now I Wanna Sniff Some Glue", is a common theme. Identifying punk with such topics aligns with the view expressed by V. Vale, founder of San Francisco fanzine Search and Destroy: "Punk was a total cultural revolt. It was a hardcore confrontation with the black side of history and culture, right-wing imagery, sexual taboos, a delving into it that had never been done before by any generation in such a thorough way." However, many punk rock lyrics deal in more traditional rock 'n' roll themes of courtship, heartbreak, and hanging out; the approach ranges from the deadpan, aggressive simplicity of Ramones standards such as "I Wanna Be Your Boyfriend" to the more unambiguously sincere style of many later pop punk groups.