"Sasha Fierce" is an alter ego created by the American singer Beyoncé. This persona was introduced in her 2008 album, "I Am... Sasha Fierce," which features a mix of pop, R&B, and soul music. The character represents a more confident and assertive side of Beyoncé, allowing her to explore different themes in her music and performances. The album was a commercial success, producing hit singles like "Single Ladies (Put a Ring on It)" and "If I Were a Boy." Through Sasha Fierce, Beyoncé was able to showcase her versatility as an artist, blending powerful vocals with dynamic stage presence.