Terracotta is often used to describe what type of material?

Terracotta is specifically associated with unglazed ceramic art. This term refers to a type of earthenware that is made from natural clay and is often fired at relatively low temperatures. The resulting material has a characteristic reddish-brown color, which is due to the iron content in the clay.

Terracotta has been widely used throughout history for a variety of artistic applications, including sculpture, pottery, and building materials. Its porous nature allows it to be easily shaped and molded, making it a versatile medium for artists. Unlike glazed ceramics, which are coated with a shiny finish that protects and enhances colors, terracotta retains a more natural and rustic appearance due to the absence of glaze.

The other options involve materials or techniques that do not align with the traditional use of terracotta. Glazed ceramics involve a protective and decorative coating, metallic sculptures pertain to artworks made from metals, and plastic arts encompass a broader category of artistic practices that can include anything from sculpture to ceramics, but do not specifically define the characteristics of terracotta.