How is a prop different from a set piece?

A prop is an object used by actors to enhance their performance and support the storytelling, such as a book or a weapon. In contrast, a set piece refers to a larger structure or element of the stage design, like a building or a tree, that creates the environment for the scene. While props are often handheld or interacted with closely, set pieces are typically fixed elements that establish the overall setting. Both are essential for creating a cohesive theatrical experience, but they serve different purposes in production.