Mastering software is used in the process of audio mastering.
Mastering is the process of editing the final stereo waveform. Mastering software is used during the final phase of editing a two-channel waveform of digital audio. Structuring the songs of an album into a desired order, balancing frequencies, placing pauses in between songs, and burning a master copy to disk are all apart of audio mastering. Professional music editing software offers powerful tools for editing a digital audio waveform using compression, expansion, limiting, equalization, and many others – plus support for many third-party plugins. Signal and audio effects processors, are the tools used for polishing your song into a tonally balanced, commercial product.