B’Day was the Beyoncé album named after her birthday and released in 2006.
The title is a stylized combination of the letter “B” from Beyoncé and “day,” referring to her birthday. Beyoncé was born on September 4, and the album was released on September 4, 2006, making the date central to its concept and marketing.
B’Day followed her debut solo album, Dangerously in Love, and arrived after Beyoncé had completed filming Dreamgirls. Its sound draws on contemporary R&B, funk, hip-hop, and pop. The album’s best-known singles include “Déjà Vu,” featuring Jay-Z, “Irreplaceable,” and “Beautiful Liar,” a duet with Shakira added to a later edition.
The title is often written as B’Day, B'Day, or Bday in informal references. It is not the same as Beyoncé’s self-titled 2013 album or 4, whose title refers to a different personal and artistic idea.