The song was released as the second single from the album on October 16, 2013. "Unconditionally" became a moderate worldwide success commercially, charting within the top twenty and top thirty of fourteen countries worldwide, including number 14 on the US Billboard Hot 100. It also became Perry's thirteenth Top 10 single on the Billboard Pop Songs chart.
"It's a love song and it's different from 'Roar' - it's not eighth-notey," said Perry. "I think it's a universal love song that everyone's going to be able to relate to no matter the age .