A DJ mixer is a crucial piece of equipment used by DJs to blend and manipulate audio from multiple sources. It allows DJs to control the volume, equalization, and effects of different audio tracks, enabling smooth transitions between songs. Most mixers have multiple channels, each capable of connecting to various audio devices like turntables, CD players, or laptops. In addition to basic mixing functions, many DJ mixers come with built-in effects and filters that enhance the sound. Some advanced models also feature digital interfaces for connecting to software like Ableton Live or Serato DJ, providing even more creative possibilities for live performances.