Libav is a collection of open-source software tools and libraries designed for handling multimedia data, such as audio and video. It provides functionalities for encoding, decoding, transcoding, muxing, and demuxing various media formats. Originally a fork of FFmpeg, Libav aims to maintain a clean and efficient codebase while offering similar capabilities. The project is widely used in various applications and systems that require multimedia processing. Developers can integrate Libav into their software to enable features like video playback, streaming, and editing. Its modular design allows for flexibility and adaptability in different programming environments.