Reply to Question about transistions between club DJs

So I have this question that I've been wondering about for a while.

I've always wondered how (EDM) DJs transistion between sets. Do they mix into the last person's set? Fade out the last person really quickly and start their own music? Somehow when I'm out I always intend to pay attention to what happens and sort of miss it - there's two guys on stage and then at the next point at which I'm paying attention there's one person on stage.

Anyway, I'm trying to get club gigs at the moment, so it's definetely something I need to know. Any and all information you guys have on this topic would be useful!