A DJ controller is a device that allows DJs to mix and manipulate music digitally. It typically features two or more channels, each with controls for volume, equalization, and effects. DJs use these controllers to blend tracks, create transitions, and add their own flair to performances. Many controllers also come with built-in sound cards, enabling direct connection to speakers and computers. Most DJ controllers are designed to work with software like Serato, Traktor, or Ableton Live. They often include jog wheels for scratching, pads for triggering samples, and faders for adjusting levels. This equipment is essential for both beginner and professional DJs, making live performances more dynamic and engaging.