Which 2008 Beyoncé album introduced the performance persona Sasha Fierce?

I Am... Sasha Fierce is the 2008 Beyoncé album that introduced the performance persona Sasha Fierce.

Released on November 18, 2008, the album was presented as a double project. The “I Am...” disc focused on more personal, emotional songs, while the “Sasha Fierce” disc emphasized bigger, more performance-driven material. Beyoncé described Sasha Fierce as an alter ego or stage persona connected with her confidence while performing.

The album included “If I Were a Boy,” “Halo,” “Diva,” and “Single Ladies (Put a Ring on It).” “Single Ladies” became especially associated with its distinctive black-and-white video and sharply choreographed dance. The project was commercially successful and won several Grammy Awards.

The title is sometimes shortened incorrectly to “Sasha Fierce,” but the complete album title is I Am... Sasha Fierce. Sasha Fierce was not Beyoncé's birth name, legal name, or a separate recording artist; it was a concept used to contrast two sides of the album's sound and presentation.