PulseAudio is a special software in Linux which acts as the proxy between applications that play sounds and Linux kernel components like ALSA or OSS. Many users prefer the pure ALSA experience. If a distro you are using, or specifically, your desktop environment depends on PulseAudio, it can be hard to uninstall it without breaking your sound capabilities. Instead, you can disable it for your user account, without affecting other users on your Linux PC.
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