Developed by Apple in 2004, M4A is an audio file created in a multimedia format. It is used to store compressed video and audio files. Worth noting, M4A files can also store images. Using different codecs, you can compress the file with or without losses. M4A is an improved version of the mp3 format. You can convert it to other formats without any loss of quality and size. Playable on devices powered by any Apple platform.

ogg

Ogg: the main file and streaming multimedia format

An open standardized format of the multimedia container type. Ogg is in the public domain and has no patent and license restrictions. Allows for playing and editing high-quality digital multimedia files. This format is not supported by devices powered by any Apple platform. An Ogg file can contain audio information and metadata. After compression, you can get files of different quality: medium or high. The compression process entails minimal loss.