What does the sash of a window hold?

The correct answer is that the sash of a window holds the glass. A window sash refers to the framework that encloses the glass panes in a window. The sash can come in various designs, including double-hung or sliding configurations, where the glass is typically mounted securely within the sash itself. This structural component is essential for the overall integrity and functionality of the window, as it not only supports the glass but also allows for opening and closing, depending on the window design.

In contrast, the other options such as the frame, screen, and sill refer to different parts of the window assembly. The frame is the outer structure that holds the entire window system, while the screen is a protective mesh covering that prevents insects from entering when windows are open. The sill is the horizontal ledge at the bottom of the window frame. Each of these components plays a distinct role in the window's performance and usability, but the sash specifically is designed to hold the glass.