"I Wanna Know" is the lead single released from R&B musician Joe's third studio album My Name Is Joe and from the soundtrack to The Wood. The single was a huge hit across the U.S. reaching number four on the Billboard Hot 100 on July 1, 2000 and number two on the Hot R&B/Hip-Hop Singles & Tracks chart. The single was released in November 1999 and went on to be Joe's third most successful hit in the U.S. behind "Stutter" (a subsequent release which peaked at number one on both the Hot 100 and Hot R&B/Hip-Hop Singles & Tracks charts) and "Thank God I Found You" alongside Mariah Carey & 98 Degrees, which made it to number one on both formats as well.
"I Wanna Know" topped the Billboard year-end charts for Top R&B/Hip-Hop Singles & Tracks Airplay in 2000. Additionally "I Wanna Know" was ranked fourth on Billboard Hot 100's Year-End Charts making it one of Joe's highest finishes on the year end charts.
A special remix of the song, entitled "The Roni Remix", can be found on a special U.K. edition of the album as a bonus track. The remix retains most of the original version's lyrics but features a different instrumental from its original as well as additional lyrics.
The music video (directed by Bille Woodruff) starts out with a woman (played by Claudia Jordan) having an argument with her boyfriend in an alley off the street. Joe and two of his friends see the ongoing argument and after the woman's boyfriend leaves he approaches her and talks to her, in the process of obtaining her phone number. The rest of the music video shows Joe and the woman spending time with each other as their relationship becomes stronger. The woman is assumed to have cut off her relationship with her boyfriend from the beginning of the music video.