The song was released by JYP Entertainment on October 24, 2016, as the lead single from their third extended play Twicecoaster: Lane 1.
They released a compilation album titled #Twice which consists of ten songs including both Korean and Japanese-language versions of "TT".
It has lyrics written by Sam Lewis, which describes a girl's pounding heart as she falls in love for the first time.
It is a K-pop song with heavy electronic influences and steady deep house snare beats.
[24][25][26] In September 2018, the music video became the first by a K-pop female act to hit 400 million views on YouTube.
[27] In the music video, the members showcased different personalities and famous characters through Halloween-themed cosplays: Jeongyeon and Momo portray Pinocchio and Tinker Bell respectively; Dahyun is the White Rabbit from Alice's Adventures in Wonderland while Sana is Hit-Girl of Kick-Ass comic series.
The full music video of the Japanese version of "TT", directed by Jimmy of BS Pictures, was released on June 21, 2017.
"[34] "TT" became one of the best-performing songs in 2016, as it claimed the top spot of Gaon's Digital Chart for four consecutive weeks.
[55][56][57][58] "TT" surpassed 100 million streams in April 2017 and 2,500,000 downloads in July 2018 on Gaon Music Chart.