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That is a fog light plug mate. One on each side of the car (L/R). Depending on what car you have, for example my 2009 GU has those but car wasn't optioned for it. The wiring for the switch is in the right hand side steering stalk, and you also have to add a relay (already provisioned in the fuse box) for everything to work.
Edit: Type in fog lights in the search box and few threads about it. Some even with pics where relay needs to go etc.