There are multiple artists that perform under the name 'DEF’:
1. A South Korean R&B artist who also goes by Jay B.
2. An emo / rock band from Brazil.

1. Def. was born as Lim Jae-beom, better known as Jay B. He is a South Korean singer, songwriter and actor. Jay B is the leader of South Korean boy band group Got7, a member of boy band duo JJ Project and sub-unit Jus2, as well as part of R&B soul crew Offshore, in addition to being Def. Def released five mixtapes in 2020 and on December 31, 2021, he announced Def.'s extended play Love., which was released on January 26, 2022.

2. Banda carioca formada por Deborah F. (guitarra e vocal), Dennis Santos (bateria), Nathanne Rodrigues (baixo) e Matheus Tiengo (guitarra). Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.