What is the name of the big decorative plate used under the dining plates?

The big decorative plate used under the dining plates is called a charger. Chargers serve both a functional and aesthetic purpose during a meal. Functionally, they act as a base to support the dinnerware above, helping to keep the table clean while also providing an elegant foundation for the meal presentation. Aesthetically, chargers add color, texture, and style to the dining experience, enhancing the overall look of the table setting.

Other options, such as the plate setting, refer to the complete arrangement of dishes and utensils on the table, not a specific type of plate. The main course plate and salad plate are specific dishes used for serving food, rather than decorative items like chargers. This distinction highlights the unique role that chargers play in formal dining settings, making them an important aspect of etiquette and table decoration.