A Tracker is a type of music sequencing software that originated on the Amiga, utilizing the platform's custom sound chip (Paula) to play back sampled sounds. Unlike traditional notation-based sequencers, trackers present music vertically in channels with note values, instrument numbers, and effects in hexadecimal format, making them highly efficient for creating module files (MODs). ProTracker became the definitive Amiga tracker, establishing a format that influenced electronic music production for decades.