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The truss rod is an adjustable metal rod that resides in the neck of the mandolin (and of course other instruments such as guitars) that can be manually adjusted in order to change the curvature of the neck. Of course not all mandolins have a truss rod, but most modern ones do.
Depending upon the configuration of your particular instrument, the adjustment is typically made by removing the truss rod cover on the headstock, although some are adjusted from inside the mandolin's sound chamber.
Unless you specifically know what you're doing, it's probably best to leave truss rod adjustments up to a repair professional as it's possible to damage an instrument if this procedure is not properly handled.
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