"J.Lo" is a pop album with Latin, dance-pop and R&B influences. Lopez revealed, "I don't think what I make is real Latin pop. I make pop music that has some Latin influence." The album is more personal and romantic than her previous, with Lopez referring to the songs as a reflection on "what I've observed and witnessed my sisters and my girlfriends going through. The songs are about having a good time and not having a good time, or partying a lot and partying too much."