Menshen or door gods are divine guardians of doors and gates in Chinese folk religions, used to protect against evil influences or to encourage the entrance of positive ones.
门神 (mén shén)
Chinese folk religion includes various types of gods, as well as revered historical figures (either real or legendary.)
One type is Door Gods.
As the name implies, paintings of these gods are pasted onto the main door of a home. The main entrance traditionally consists of two doors, so the gods always appear in pairs.