JB is a popular abbreviation that can refer to various subjects, but it is most commonly associated with Justin Bieber, a Canadian singer and songwriter. He gained fame as a teenager with hits like "Baby" and has since released multiple successful albums. His music spans genres such as pop, R&B, and electronic dance music. In addition to his music career, JB is known for his influence on social media and his philanthropic efforts. He has a large following on platforms like Instagram and Twitter, where he shares updates about his life and engages with fans. His impact on pop culture continues to be significant.