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 each audio channel, enabling smooth transitions between songs. Most mixers have multiple input channels, allowing DJs to connect various devices like turntables, CD players, or laptops. In addition to basic mixing functions, many DJ mixers come with built-in effects and filters, enhancing the overall sound. Some advanced models also feature digital interfaces for connecting to computers and software, making it easier for DJs to create unique mixes and live performances.