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Yes, it is possible to be a DJ using just a laptop. There are various DJ software available that can help you mix and edit tracks, apply effects, and manage your playlist. Some popular DJ software includes Serato DJ, Traktor, and Virtual DJ. These programs can be used on laptops with enough processing power and RAM. You may also need a good quality sound card and an external audio interface for better sound quality. However, using a laptop alone may limit your ability to use hardware controllers or CDJs, and you may also miss out on some features and possibilities offered by professional DJ equipment.