What type of windows have sashes that slide either vertically or horizontally?

Sliding windows feature sashes that slide smoothly either vertically or horizontally to open and close. This design allows for excellent ventilation while maintaining a sleek profile, making them an ideal choice in many modern building applications. Unlike fixed windows, which do not open, sliding windows are practical for spaces where operable windows are desired without requiring additional space for door swings.

Awning windows, on the other hand, are hinged at the top and open outward, while single hung windows typically have one fixed sash and one movable sash that slides vertically. Each of these alternatives serves specific functions but does not have the characteristic sliding mechanism that defines sliding windows.