Rockers are members or followers of a biker subculture that originated in the United Kingdom during the late 1950s and was popular in the 1960s. It was mainly centred on motorcycles and rock 'n' roll music. By 1965, the term greaser had also been introduced to Great Britain and, since then, the terms greaser and rocker have become synonymous within the British Isles, although used differently in North America and elsewhere. Rockers were also derisively known as Coffee Bar Cowboys. Their Japanese counterpart was called the Kaminari-Zoku.

Greasers are a youth subculture that emerged in the 1950s and early 1960s from predominantly working class and lower-class teenagers and young adults in the United States and Canada. The subculture remained prominent into the mid-1960s and was particularly embraced by certain ethnic groups in urban areas, particularly Italian Americans, Hispanic Americans, and Latin Americans.