Kitchen, Undermount Sink, and Pendant Lighting As the name implies, undermount sinks are attached to the underside of a countertop, where special clips ensure the sink stays in place or the sink is supported from underneath by the base cabinet structure.  Photo 10 of 11 in Clerestory windows by Samantha Gray from A Midcentury Modern Renovation Opens Interiors and Admits More Sunlight

Clerestory windows

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As the name implies, undermount sinks are attached to the underside of a countertop, where special clips ensure the sink stays in place or the sink is supported from underneath by the base cabinet structure.