There are several types of deejays. Radio DJs introduce and play music that is broadcast on AM, FM, shortwave, digital, or online radio stations. Club DJs select and play music in a bar, club, disco, at a rave, or even in a stadium.
Hip-hop deejays select and play music using multiple turntables, often to back up one or more MCs. The reggae deejay is a vocalist who raps or chats over pre-recorded rhythm tracks while the individual choosing and playing them is referred to as a selector. Mobile DJs travel with portable sound systems and work at a variety of events.
A good DJ should have the basis of his appeal firmly rooted in the choice of music he plays, his range and how he allows one track to relate to another. In this day and age many DJs are more likely to try to impress with technical ability, as oppossed to their skill in selecting music. What definitely makes the difference, is the DJs ability to CREATE ATMOSPHERE with his musical selection.