The Great Unknown is the twelfth studio album by Filipino singer Sarah Geronimo. It was released in the Philippines on December 4, 2015, through Viva Records and debuted at number two in Philippines iTunes pop music album chart behind Adele's 25. It was made available for purchase on December 4, 2015 despite releasing new tracks from previous album, Perfectly Imperfect.

On August 24, 2015, songwriter Yumi Lacsama posted a picture of her with Thyro and Sarah on her Instagram account. The picture showed all three them smiling with Thyro holding up a paper with what netizens thought as words written for a new song. Weeks after, Yumi posted another photo of Sarah in the recording studio. The album also features the songs of promising songwriters in the industry.

In the album's line up songs, Geronimo collaborated with singers Yeng Constantino and Hale. Geronimo also worked once again with Yumi Lacsamana and Thyro Alfaro, who wrote the carrier singles of her previous albums such as Ikot-Ikot for Expressions album and Kilometro for Perfectly Imperfect.

On December 4, 2015, Sarah teased her new album by performing the ninth track "Tala" (Star) in her concert "From The Top" and the song went viral in social media. It became the most streamed song in the album and it immediately ranked top spot in Pinoy Charts on Spotify Philippines. Viva Records released the lyric video on December 19, 2015 and Sarah Geronimo performed the carrier single on TV at the ASAP Live Stage on January 31, 2016. The music video premiered on June 10, 2016 at MYX & June 11 at MTV Pinoy. It peaked #1 on MYX Daily Top 10, Pinoy MYX Countdown, MTV Top 20 Pilipinas & MTV Today's Top 10. And also, "Tala" placed at Pinoy MYX Countdown and MYX Hit Chart Year-ender Countdown

"The Great Unknown" is the second single of this album released on September 24, 2016 and its music video premiered at MYX and at MTV Pinoy on September 26. "The Great Unknown" peaked 7 weeks at number one on Pinoy MYX Countdown & 30 days at number 1 on MYX Daily Top 10: Pinoy Edition. Also, "The Great Unknown" peaked at number one on MTV Top 20 Pilipinas & MTV Today's Top 10. And also, "The Great Unknown" placed first at MTV Top 20 Pilipinas 2016 Year-ender Countdown.

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