I'm not a musician so I don't understand this. I took it directly from a music dictionary. Hope you understand it, because I sure don't.
Syncopation is the stressing of a normally unstressed beat in a bar or the failure to sound a tone on an accented beat.
Syncopation is used in many music styles, including classical music, but it is a fundamental constant presence in such styles as ragtime and jazz. In the form of a backbeat, syncopation is used in virtually all contemporary popular music.