Indie rock originated in the UK in the 1980s as a genre of alternative rock and is defined by its diverse subgenres such as indie pop and lo-fi. In the 1990s, as genres like grunge and Britpop became mainstream, indie rock came to represent bands that maintained an outsider perspective. In the 2000s, some indie rock acts began to enjoy commercial success due to changes in the music industry.

2.  Indie rock is a genre of alternative rock that originated in the
United Kingdom in the 80s.
 Indie rock is a diverse genre, with many different sub-genres,
such as: indie pop, jangle pop, C86, and lo-fi, and so many
more.
 As more genres became mainstream (grunge and punk
revival - bands in the US, and Britpop bands in the UK, in the
90s, Indie Rock became used to identify acts that retained an
outsider and underground perspective.
 In the 2000s, as a result of changes in the music industry a
number of indie rock acts began to enjoy commercial
success.
 In the mid-1980s, the term "indie" began to be used to
describe the music produced on post-punk labels.

3.  The Vaccines
 The Charlatans
 Of Monsters and Men
 Bon Iver
 Two Door Cinema Club
 Kaiser Chiefs
 The Libertines
 Broken Social scene
 Bombay Bicycle Club
 The Fratellis
 Coldplay
 Blur
 The Wombats
 Oasis
 Razorlight
 Snow Patrol
 Daughter
 The Enemy
 Foster The People
 The Fray
 Haim
 Kings of Leon
 Kodaline
 Kids in Glass Houses
 The Killers
 The Kooks
 Ingrid Michaelson
 Nada Surf
 Peace
 Noah and the Whale
 Sonic Youth
 Swim Deep