what are the square shaped cut out thingy’s on the new 2008 and 2007 model cars?

on new cars i notice there are (on the front bumper and back bumper) there are square shaped cut outs, what are they? Why are they there? What purpose do they serve? Why only on new cars?

Maybe they’re the watchamacallits you use to put the metal thingamabobs on…

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