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Picom is a lightweight standalone compositor created for the X Window System. It is a fork of compton, created because compton wasn't being actively maintained;[1] compton is, in turn, a fork of xcompmgr-dana, forked from xcompmgr.[2][3][4]
Picom can be configured using a config file which in most systems is located at $XDG_CONFIG_HOME/picom.conf. However, picom can also be started with a custom config file using the following options:[2]
picom --config ~/.config/picom/picom.conf
Picom has multiple configurations in which it can be run, however in most instances, when using it in conjunction with another window manager, the -b flag is used to start it as a background process.[2][5]