A drop-in sink is a type of sink that is designed to be installed into a countertop. It features a rim that rests on the surface of the countertop, allowing for easy placement and installation. This style is popular in kitchens and bathrooms due to its straightforward setup and variety of designs. Typically made from materials like stainless steel, porcelain, or composite, drop-in sinks come in various shapes and sizes to fit different needs. They are often paired with faucets and drain assemblies to create a complete sink system, making them a practical choice for homeowners and builders alike.