1 is the second Korean-language studio album (third overall) by South Korean recording artist BoA.

The album's composition and arrangement was handled by several music collaborators, such as Yoo Young-jin, Kangta, Ahn Ik-soo, Sigurd Heimdal Rosnes, among others.

1 marked BoA's return to South Korea following the release of her debut Japanese album Listen to My Heart a month prior, which saw widespread recognition in Japan.

It won various awards in South Korea, including the Most Popular Music Video (daesang) at the 2002 Mnet Music Video Festival and Grand Prize (daesang) at the 2002 SBS Gayo Daejeon.

1 experienced greater success in South Korea compared to her debut album ID; Peace B (2000).