B1A4 is a South Korean boy band formed by WM Entertainment in 2011. The group originally consisted of five members: Jinyoung, CNU, Sandeul, Baro, and Gongchan. They are known for their catchy pop songs and vibrant performances, quickly gaining popularity in the K-pop scene. The name B1A4 stands for "Be the One, All for One," reflecting their unity and teamwork. They have released several albums and hit songs, including "OK" and "Lonely." Over the years, B1A4 has also participated in various television shows and events, showcasing their talents beyond music.