"Firework" is a song by American singer Katy Perry from her third studio album, Teenage Dream (2010). Perry co-wrote the song with Ester Dean and the song's producers Stargate and Sandy Vee. It is a dance-pop self-empowerment anthem with inspirational lyrics, and Perry felt it was an important song for her on the record. Capitol Records released it as the album's third single on October 26, 2010.

Katheryn Elizabeth Hudson, known professionally as Katy Perry, is an American singer, songwriter, and television personality. She is known for her influence on modern pop music and her camp style, being dubbed the "Queen of Camp" by Vogue and Rolling Stone. At 16, Perry released a gospel record titled Katy Hudson (2001) under Red Hill Records, which was commercially unsuccessful. She moved to Los Angeles at 17 to venture into secular music, and later adopted the stage name "Katy Perry" from her mother's maiden name. She recorded an album while signed to Columbia Records, but was dropped before signing to Capitol Records.