* Audacity supports a limited number of audio formats (including WAV, AIFF, MP3 (import only), OGG and FLAC). ** When working with audio, the audio data should be kept in a "lossless" format as far as possible so as to avoid deterioration of the sound quality. When audio data is written to a file in a "lossy" format (such and MP3, OGG, AAC or AC3), the audio data is "compressed" so as to make the file smaller, but there is a cost that some of the audio data is discarded and some audio quality is lost. So when exporting from Audacity to a WAV format, the WAV file will be virtually identical to the audio data in Audacity. When audio data is written to a file in a "lossless" format (such as WAV, AIFF or FLAC), then the audio data in the new file is virtually unchanged. * There are two broad categories for audio file formats: "lossless" and "lossy". Audacity does not operate on the original file.
When a file is "Imported" (including using the "File > Open" command), Audacity copies audio data from the file and works with the copied data. * Audacity does not operate directly on files.
* Audacity cannot import video and cannot do anything with video.
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