Phoc is a Wayland compositor authored by Purism included in PureOS for the Librem 5. Compositors, such as Phoc, is a window manager that provides applications with an off-screen buffer for each window that composites the window buffers into an image representing the screen and writes the result into the display memory.
PureOS on the Librem 5
The Librem 5 represents the opportunity for you to take back control and protect your private information, your digital life through free and open source software, open governance, and transparency.