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. .
