K/DA is a virtual K-pop–inspired girl group consisting of four themed versions of League of Legends characters: Ahri, Akali, Evelynn and Kai'Sa. American singers Madison Beer and Jaira Burns and (G)I-dle members Miyeon and Soyeon provide the voices of Evelynn, Kai'Sa, Ahri, and Akali respectively, though the characters have also been voiced by other artists. K/DA was developed by Riot Games, the company behind League of Legends, and unveiled at the 2018 League of Legends World Championship with an augmented reality live performance of their first song, "Pop/Stars". A music video of the song uploaded to YouTube subsequently went viral, surpassing 100 million views in one month, and reaching 400 million views, as well as topping Billboard's World Digital Song Sales chart. This would be followed up with the release of an EP in 2020, entitled All Out which featured 5 new songs. The EP's second single "More" received a music video which has over 100 million views as of July 2021.
The conception of K/DA was based on Riot's expressed desire to create more musical content in the future, with the characters chosen based on K-pop archetypes. The group was created to promote the League World Championship and to sell in-game K/DA skins of the characters in League of Legends. K/DA has subsequently achieved significant popularity both within and beyond the League of Legends fandom, and received critical acclaim, especially for their performance during the World Championship and the impact of gaming on the music scene.