Song's lyrics describe a female protagonist who declares herself as unbreakable and strong following a break-up. Many critics theorized that the lyrics addressed Perry's divorce from Russell Brand, although Perry stated it was not about him since it was written in early 2010.
It was the twentieth song to debut at number-one on the Billboard Hot 100.
Perry's seventh number-one single on the chart, and her ninth consecutive number-one single on the Billboard Hot Dance Club Songs chart.
The single debuted at number-one in Canada and the United Kingdom.
The song has been certified Platinum in Australia, New Zealand, and the United States.