Do you mean DJing in the sense of playing curated playlists for events? Or DJing in the sense of mixing synthesizers, samples, and original recordings to create music? I imagine you're talking about the former.
The latter sounds like Production, rather than DJing.
It is production, but DJing has come to be used to describe both things, at least in California. The line is especially blurred because a lot of popular electronic producers perform live, which ranges from anything to mixing music in real time to playing pre-produced tracks, both of which resemble traditional DJing.