The image displays an electric bain-marie, also known as a food warmer or a double boiler, which is a piece of commercial kitchen equipment.
It is used to keep cooked foods warm or to cook delicate dishes using indirect, gentle heat from a chamber of hot water.
The stainless steel construction is designed for durability, easy cleaning, and resistance to rust and corrosion in food service environments.
This specific unit appears to be a countertop model with six individual pans and lids, suitable for buffet service.
The gentle heating method helps prevent food from burning, sticking to the pan, or drying out over time.