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Professional DJs use various software depending on their preferences and requirements. However, some of the most popular DJ software among professionals include Serato DJ Pro, Rekordbox by Pioneer DJ, Traktor Pro by Native Instruments, and Virtual DJ. These programs offer advanced features for mixing, scratching, effects processing, and often include time-stretching capabilities, sync functions, and extensive library management options. It is important to note that often the selection of the software is also determined by the hardware the DJ uses, as not all software is compatible with all DJ controllers and interfaces.