Vessel sinks, drop-in sinks, and undermount sinks are three types of popular bathroom sinks. Each type has its unique features, installation method, and aesthetic appeal. Here's a brief explanation of the differences:

Vessel Sinks: A vessel sink is a sink that sits on top of a bathroom counter, with the entire sink visible. They are generally bowl-shaped, and they can be made of various materials such as ceramic, glass, stone, or metal. Vessel sinks provide a unique and modern look and are usually used in contemporary or modern bathrooms. They require a counter or vanity that is specifically designed to accommodate their height, and the faucet is usually installed on the counter or the wall above the sink.

Drop-In Sinks: Drop-in sinks, also known as self-rimming or top-mount sinks, are designed to fit into a hole cut in the bathroom counter or vanity. The sink's rim or lip sits on top of the counter, and the basin drops into the hole. These sinks are relatively easy to install and are often less expensive than other sink types. They come in a variety of shapes, sizes, and materials to fit any style of bathroom decor.

Undermount Sinks: An undermount sink is installed underneath a bathroom counter or vanity, with the sink's rim hidden from view. The sink is attached to the underside of the counter using clips or mounting brackets, which provides a seamless and clean look. They are usually made of materials like ceramic, stainless steel, or stone, and are popular in modern or minimalist bathroom designs. Undermount sinks are more challenging to install than drop-in sinks and require a solid surface countertop like granite, marble, or quartz.

In summary, vessel sinks sit on top of a counter, drop-in sinks drop into a hole in the counter, and undermount sinks are installed underneath the counter. The choice of sink type depends on personal preference, bathroom decor, and installation requirements.