B'Day is Beyoncé's second studio album, released on September 4, 2006. It was conceived as a concept album inspired by the singer's birthday and the celebration of femininity. The recording sessions took place in just two weeks, aiming to capture a raw, festive energy.
The album debuted at number one on the Billboard 200, selling over 541,000 copies in its first week. It includes hits such as 'Déjà Vu', 'Irreplaceable', and 'Beautiful Liar'. 'Irreplaceable' became one of the most successful singles of the decade, reaching number one in multiple countries.
B'Day received generally positive reviews, highlighting its cohesive production and Beyoncé's vocal evolution. It was nominated for several Grammy Awards, winning Best Contemporary R&B Album in 2007. The album has sold over 8 million copies worldwide.