OGA is a format of free container audio files, a kind of audio container. The developer is Xiph.Org. The full original name is Ogg Vorbis Audio File. This audio container runs on Ogg Vorbis, a widely used audio encoding and streaming technology. The container stores audio data with compression using Vorbis compression. OGA audio files can also use the .OGG extension because they are a standard Ogg container. Any Ogg-enabled media player must play OGA audio files.
FLAC is a free cross-platform audio codec format created in 2001 by Josh Colson and Xiph.Org. The name of the format is an abbreviation of the English phrase Free Lossless Audio Codec. When compressing a file into the FLAC format, it is 50-60% of the original file without loss of sound quality (especially when working with voice recordings). When unpacking such a file, absolute originality is respected. Since the format is free and open, it is supported by almost any software, it is perfect for archiving files and for regular listening to digital recordings.