Grunge (sometimes referred to as the Seattle sound) is a subgenre of alternative rock that emerged during the mid-1980s in the American state of Washington, particularly in the Seattle area. Inspired by hardcore punk, heavy metal, and indie rock, grunge is generally characterized by heavily distorted electric guitars, contrasting song dynamics, and apathetic or angst-filled lyrics. The grunge aesthetic is stripped-down compared to other forms of rock music, and many grunge musicians were noted for their unkempt appearances and rejection of theatrics.

The early grunge movement coalesced around Seattle independent record label Sub Pop in the late 1980s. Grunge became commercially successful in the first half of the 1990s, due mainly to the release of Nirvana's Nevermind and Pearl Jam's Ten. The success of these bands boosted the popularity of alternative rock and made grunge the most popular form of hard rock music at the time. However, many grunge bands were uncomfortable with this popularity. Although most grunge bands had disbanded or faded from view by the late 1990s, their influence continues to affect modern rock music.

Source: Wikipedia