What is LoginWindow on activity monitor?

i checking activity monitor , saw process (loginwindow) wondering is.

 

quote

user processes (generally owned current user)
loginwindow
partly user process, made of plastic -- starts before logs computer, , responsible displaying login screen (or not, if autologin set), validating login attempts, , setting user environment (launching finder, dock, login apps, etc) @ login. acts process monitor user processes, restarts finder or dock if crash, , implements force quit applications window. finally, handles logout, restart, , shutdown procedures.

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from mac os x: processes? found via "loginwindow mac process"

 

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