This format was created for online broadcasting. Opus is an audio codec for compression used on the Internet in real-time mode. Employed by programs such as Skype and Mozilla. Mostly used in interactive applications. The advantages of Opus are high audio quality and good compression. It works only on devices powered by Windows. Opus files can be converted to similar extensions.

caf

Core Audio Format

This audio file container was created by Apples developers. CAF incorporates a huge amount of information: the artists name, the songs duration, the names of the album and track. In terms of size, files of the CAFformat can exceed 4 GB. After its emergence in 2005, Core Audio Format replaced AIFF and WAV. It has a lower compression ratio, so the quality of audio does not suffer as a result of compression. CAF files are often used to create various sound effects.