A Compact Disc Jockey, often abbreviated as CDJ, is a professional who mixes music using compact discs instead of traditional vinyl records. CDJs allow DJs to manipulate tracks with features like pitch control, looping, and effects, making it easier to create seamless transitions between songs. This technology has revolutionized the way DJs perform, enabling them to access a vast library of music stored on CDs. CDJs are commonly used in various settings, including nightclubs, festivals, and private events. They often come equipped with digital displays and can connect to laptops or DJ software for enhanced functionality. This versatility has made CDJs a popular choice among both amateur and professional DJs.