Yellow (stylized in all caps) is the fourth extended play (EP) by South Korean singer and songwriter Kang Daniel.

Kang, who penned the lyrics himself, drew inspiration from when he went on hiatus due to mental and physical health issues and expressed the pain and anguish he had experienced.

[3][4][5] On March 18, Kang confirmed a follow-up comeback scheduled for April 13 with the release of his new album Yellow, promising tracks full of meaningful messages.

Yellow captures the time when Kang was at his lowest point due to deteriorating health exacerbated by cyberbullying and chronicles his journey to recovery.

[15][16] Prior to the album's release, Kang appeared on the hundredth episode of MBC's Where Is My Home as the show's founding contributor and Problem Child in House to introduce his upcoming music.

[26] Following the release of Yellow, Kang earned his first Gaon quadruple crown by topping the digital, album, download, and BGM weekly charts.

[31] In an article collecting Genius Korea's favorite albums of 2021, Yellow was described as being "mesmerizing without being enigmatic; its somber mood allows us to focus on the messages Kang succeeds to convey, without any word being lost in translation".

The EP was included in a list titled "Best K-pop Albums of 2021 so far" by South China Morning Post where Tamar Herman said Kang "reached new heights" with its release.