"They Don't Know" is a single by R&B singer Jon B released in 1998. Jon B also performed the song in an episode of the sitcom, Sister, Sister

Sister, Sister (TV series)

Sister, Sister is an American television sitcom about identical twin girls Tia Landry and Tamera Campbell , who were separated and adopted at birth, when one day they come face-to-face after 14 years apart....

, where he guest starred as himself. The single was produced by the duo Tim & Bob

Tim & Bob

Tim & Bob aka Funktwons, are Grammy Award-winning songwriting musicians and a Hip-hop/R&B pop production duo. Tim & Bob have discovered and or worked on some of the biggest artists in the music industry and has helped develop the Atlanta music scene as it is widely known for today...

, and it is Jon B's biggest commercial success by selling over a million copies and peaking at number seven on the Billboard Hot 100

Billboard Hot 100

The Billboard Hot 100 is the United States music industry standard singles popularity chart issued weekly by Billboard magazine. Chart rankings are based on radio play and sales; the tracking-week for sales begins on Monday and ends on Sunday, while the radio play tracking-week runs from Wednesday...

 and number two on the R&B Singles

Hot R&B/Hip-Hop Songs

Hot R&B/Hip-Hop Songs, is a chart released weekly by Billboard in the United States.The chart, initiated in 1942, is used to track the success of popular music songs in urban, or primarily African American, venues. Dominated over the years at various times by jazz, rhythm and blues, doo-wop, soul,...

chart.

Charts

End of year chart (1998)	Position
U.S. Billboard Hot 100	39