Taeyeon is the leader and 1st main vocalist of the popular nine-member South Korean girl group, Girls' Generation.

Main article: Girls' Generation
Taeyeon has contributed to a couple of soundtracks as a solo artist, singing the theme song "Manyageh" ("만약에", "If") for the KBS2 drama Hong Gil Dong and "Deullinayo" ("들리나요", "Can You Hear Me") from the Beethoven Virus soundtrack. "If" became popular[clarification needed] on various online charts, around the same time "Baby Baby" was released, while "Deullinayo" received the YEPP Popularity award at the 2008 Golden Disk Awards.

She also sang "SarangInGulYo" ("사랑인걸요", "It is love") with Sunny for the drama Heading to the Ground, and the "S.E.O.U.L." song with members of Super Junior and Girls' Generation to promote their beloved country. She also sang the song for Caribbean Bay / "Cabi" with her fellow members Jessica, Seohyun, Tiffany and Yuri with 2PM.

She sang a duet song with her mentor The One, called "Like a Star" which was released on November 17, 2010. She also sang in the soundtrack of SBS's Athena:Goddess of War, with the song "I Love You". The song was released on 13 December 2010. The song took number 1 in some hit charts.

On January 31, 2011, Taeyeon sang a duet with Kim Bum Soo, titled "Different". The song also took number 1 not long after it was released.

She has also featured on Kangta's Album Eternity, singing 7989.

On May 7, 2010, she had her musical debut as the main female role in "Midnight Sun", which is based on the Japanese novel "Taiyō no uta" by Aya Denkawa. The musical is about Kaoru Amane, a 17-year-old girl, who suffers from Xeroderma pigmentosum, forbid her to going out during the daytime. She keeps her hopes up by writing songs and singing every night at a train station. Taeyeon received good press for her performance. Furthermore, she learned to play guitar for her musical performance.

Taeyeon and her band mate Seohyun were cast as voice actors for the Korean dub of the 3D animation Despicable Me. Taeyeon dubbed the voice of the character Margo, while Seohyun's role is Margo's younger sister Edith.

TV shows
She was featured on Munhwa Broadcasting Corporation reality-variety show We Got Married as part of the third rotation of couples; she was featured with comedian Jeong Hyeong-don. When this news was announced on January 7, 2009, it caused an uproar among South Korean netizens due to the 11-year age difference between the two.

Taeyeon was also a sub MC for Kim Seungwoo's talk show, 'SeungSeungJangGu' (Korean: 승승장구) on KBS, MCing alongside 2PM's Wooyoung, Choi Hwajung, Kim Shinyoung, and Kim Seungwoo.

Taeyeon, along with fellow Girls' Generation members Tiffany and Seohyun is an MC on MBC's Show! Music Core from February 11, 2012.

Radio Shows
Taeyeon became a DJ on MBC Radio's Good Friend Radio, which she co-hosted with Super Junior's Kangin until he left on April 19, 2009. From then on, she hosted the radio show single-handedly. Earning the nickname"DJ Taengoo". Taeyeon ceased her DJ duties from April 26, 2010 onwards.

Soundtrack appearances and Solo Performances
2004 - You Bring Me Joy - You Bring Me Joy - Duet with The One
2008 - KBS Hong Gil Dong OST - If - Solo
MBC Beethoven Virus OST - Can You Hear Me? - Solo
2009 - MBC Heading To The Ground OST - It's Love - Duet with Sunny
2010 - Like A Star - Like A Star - Duet with The One
SBS Athena: Goddess of War OST - I Love You - Solo
2011 - Different Different - Duet with Kim Bum Soo

Singles
KOR
Gaon
2010 "Like A Star" (with The, One) - Digital Single
"I Love You" - Athena: Goddess of War OST
2011 "Different" (with Kim Bum Soo) - Digital Single

Film
2010 - Despicable Me - Margo (voice-over) - Korean version
Drama
2008 - Unstoppable Marriage- As BoolGwangDong (Seven princess) (Cameo)
2012 - Salamander Guru and The Shadows - As TaeYeon (Cameo)
Television Series
2008 - Family Outing Guest - Ep 13 & 14
2009 - We Got Married - Herself
2010 - Win Win - Host
2011 - Running Man - Guest 63 & 64
2012 - Show! Music Core - Host

2004 - 8th Annual Best Contest - Best Singer 1st Place & Grand Award - Won
2008 Cyworld Song of the Month: February "If" - Won
2008 Mnet Music Award – Best OST "If" - Nominated
Mnet 20's Choice Awards Hot DJ - Won
23rd Golden Disk Awards Yepp Popularity Award for "Deullinayo" - Won
2009 Program Production "Good Friend Radio (ChinChin)" - Won
2009 MBC Drama Awards [Radio Newcomer Award] "Good Friend Radio (ChinChin)" - Won
2010 16th Republic of Korea Entertainment Arts Awards Female Radio Award - Won
Yahoo Buzz! Award's Top Buzz Star:Female Category Herself - Nominated
2011 The 5th Musical Awards Best Newcomer - Nominated
2011 Mnet Music Award – Best OST "I Love You" - Nominated
2011 Mnet Music Award – Song of the Year "I Love You" - Nominated
2011 MelOn Music Awards – Best OST "I Love You" - Nominated