This refers to how the sink is installed relative to the countertop. The fitting type often influences the final look and ease of cleaning the countertop surface.
Inset
Inset or Drop-in/Top-mount sinks drop into a cutout in the countertop, resting on its rim.
Pros; Easy to install, rim protects the countertop edge from spills.
A composite or granite finish featuring tiny color variations or flecks (e.g., black speckles on a gray background). Helps disguise dirt and water spots.