pop is mainstream. pop focuses alot on mainstream sounding effects (for that particluar era). for example pop of the 80s are now the "disco" type soundings patches, like phasers and that nonsense. pop simply means popular
jazz is different, so DON'T EVER associate pop with jazz, unless the term POP/JAZZ refers to POPULAR JAZZ, then its fine. Jazz focuses alot on the beat and rhythm of the song, the semiquavers and 7ths. alot of theory, chordwork and structure required in jazz. it may sound easy, snazzy and extremely cool (think blues), but its damn difficult.
JAZZ ROCKS!