.opus
Opus audio
A royalty-free codec standardised by the IETF in 2012 (RFC 6716), usually stored in an Ogg container. It handles both speech and music well at very low bit rates.
Voice calls, voice notes and streaming, where low delay and small size matter.
Opens in Chrome, Firefox, Edge, VLC, Audacity
About OPUS files.wav
WAV audioWaveform Audio File Format
Microsoft and IBM’s audio format from 1991. It normally stores uncompressed PCM samples, keeping full quality at the cost of large files.
Recording, editing and mastering, and sound effects for video and games.
Opens in Music, QuickTime, Windows Media Player, VLC, every audio editor
About WAV files