Tilt and turn windows function by tilting inwards at the top, or can be opened inwards like a casement window from the hinges at the side. This helps provide better ventilation and improved protection from rain and heat, and makes them easy to clean as well.
Tilt and turn window's structure requires it to have more sturdy hardware with multi-locking system. Moreover, the in-swing hinges secure windows from being forced open from the outside. Tilting positions also add to the security, while also enabling ventilation.
Tilt and turn windows function through tilting the window at the top for allowing regulated ventilation and turning inward for opening and allowing cleaning and efficient access of the window. By turning the handle to 90° and then pulling the window towards you into the tilt position, you can easily access the window.
When compared to casement or sliding windows, tilt and turn windows are indeed a bit more expensive. This is due to their rather complicated operating system and locking mechanisms, which require more cost of production.