A DJ controller is a device you use to mix your music collection. For example, you can connect the DJ controller to a laptop and control it with the installed DJ software. You can often also connect other players like turntables or CD players to mix music with analogue equipment. This means you don't need a DJ set worth thousands of euros. The Pioneer DJ DDJ 200 is a starter model suitable for beginner DJs. If you've already mastered the ins and outs of DJing, choose the Hercules DJControl Inpulse T7. The Pioneer DJ DDJ-FLX 4 is the middle way. You can use this controller when you have some experience, but want a simple control panel.