OpenAL, short for Open Audio Library, is an open-source audio API that enables developers to implement 3D positional audio in software applications, particularly in video games. It offers spatial sound rendering, allowing sounds to be placed within a three-dimensional space, enhancing user experience through immersive audio. OpenAL supports multiple platforms, including Windows, macOS, and Linux, making it a popular choice for developers creating realistic sound effects and audio environments in interactive applications.