It is not a sound driver - in fact, it runs on top of the Advanced Linux Sound Architecture (ALSA). Simplified: PulseAudio is responsible for playback and mixing of audio on your system. Things like transferring the audio to a different machine, changing the sample format or channel count and mixing several sounds into one are easily achieved using a sound server. It allows you to do advanced operations on your sound data as it passes between your application and your hardware. A sound server is basically a proxy for your sound applications. PulseAudio is a sound server for POSIX and Win32 systems.
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