Understanding these components can help you in selecting, maintaining, or replacing windows in your home. 

The anatomy of a window refers to the various parts and components that make up a window structure. While exact features can vary based on style (e.g., single-hung, double-hung, casement), here are the most common elements: 

🔧 Basic Window Anatomy Terms

1. Frame: The outer structure that supports the entire window; includes the head, jambs, and sill.
2. Sash: The movable or fixed part of the window that holds the glass panes.
3. Glass (Pane): The transparent part of the window, often double- or triple-glazed for insulation.
4. Grilles / Muntins: Decorative or functional strips that divide the glass into panes. These may be part of the sash or inserted between panes.
5. Glazing: The process or material used to secure the glass into the sash.
6. Stile and Rail: Components of the sash.

🏠 Optional or Specialized Parts

1. Apron: The trim piece located directly below the window sill on the inside.
2. Casing (Trim): The decorative molding that covers the gap between the window frame and the wall.
3. Hardware: Includes locks, handles, and cranks (especially in casement or awning windows).
4. Weatherstripping: Material that creates a seal to reduce air and water infiltration.
5. Screen: A mesh installed over the window to allow ventilation while keeping insects out.
6. Balance: A hidden mechanism in double-hung windows that helps support the weight of the sash and allows it to move smoothly.