K/DA is a virtual K-pop girl group consisting of four themed versions of League of Legends characters Ahri, Akali, Evelynn and Kai'Sa. Evelynn and Kai'Sa are voiced by American singers Madison Beer and Jaira Burns respectively, while Ahri and Akali are voiced by (G)I-dle members Miyeon and Soyeon. 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 and only song, "Pop/Stars". A music video of the song uploaded to YouTube subsequently went viral, surpassing 100 million views in one month, and reaching over 250 million views, as well as topping Billboard's World Digital Song Sales chart.

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 band 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 that of the League of Legends fandom, and has received critical acclaim, especially with regards to their performance during the World Championship and the impact of gaming on the music scene.