OGG is a free, open-source container format used for digital multimedia. It can store various types of data, including audio, video, and text, making it versatile for different applications. The format is designed to efficiently stream and manipulate high-quality multimedia content. One of the most common uses of OGG is with the Vorbis audio codec, which provides high-quality sound at lower bit rates compared to other formats like MP3. This makes OGG Vorbis popular for music streaming and online audio distribution, as it balances quality and file size effectively.