Undermount sinks are a type of sink installed beneath the countertop, creating a seamless look. This design allows for easy cleaning, as there are no edges or rims to trap dirt and debris. They are commonly made from materials like stainless steel, ceramic, or composite, which can complement various countertop materials. These sinks are popular in both kitchens and bathrooms due to their modern aesthetic. However, they require a sturdy countertop, as the weight of the sink is supported by the countertop material. Proper installation is crucial to prevent water damage and ensure durability.