A vessel sink is a type of sink that sits above the counter-top surface. Unlike traditional sinks that are mounted below the counter-top, vessel sinks are higher than the surface of the counter. They may be partially recessed into a hole, providing some support for the basin, or they may rest completely on top of the counter. Vessel sinks come in a variety of styles, designs, and materials. Popular materials include wood, glass, and copper. The shape of the basin can also vary, with options such as bowl-shaped, rectangular, square, or nearly flat. While vessel sinks can work with any design style, homeowners should keep in mind that they do not have overflow relief drains and require separate faucet installation, so plumbing needs should be considered before selecting a vessel sink.