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. (G)I-dle members Miyeon and Soyeon provide the voices of Ahri and Akali, respectively, Madison Beer voices Evelynn, and Jaira Burns provided the voice for Kai'Sa. However, the characters have also been voiced by other artists.

K/DA was developed by Riot Games, the company behind League of Legends, and was unveiled at the 2018 League of Legends World Championship with an augmented reality live performance of their debut single, "Pop/Stars". A music video of the song uploaded to YouTube subsequently went viral, surpassing 100 million views in one month, reaching 550 million views as of May 2023, and topping Billboard's World Digital Song Sales chart. In 2020, K/DA released their debut five-track EP All Out, which includes the pre-release single "The Baddest" and the lead single "More". In 2022, "Pop/Stars" was certified platinum by the Recording Industry Association of America (RIAA), making K/DA and (G)I-dle the first K-pop girl groups in history to achieve this milestone.

The conception of K/DA was based on Riot's expressed desire to create more musical content, 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, particularly for their performance during the World Championship and the impact of gaming on the music scene.