This type of window has a single stationary sash and another sash that can be moved up and down. Typically, it can also be tilted into the room to provide easy cleaning and maintenance.
Single-hung windows also feature a screen that covers half of the window. Single-hung windows are perfect for modern homes because they cost less than double-hung windows. They are also less susceptible to leakage or air infiltration because the upper sash is fixed and will not develop looseness the way a moving sash will.