Window mechanisms are the systems that allow windows to open and close. Common types include hinged, sliding, and casement mechanisms. Hinged windows swing open on a pivot, while sliding windows move horizontally along a track. Casement windows are attached to the frame by hinges and open outward, providing ventilation and easy access. These mechanisms can be operated manually or automatically. Manual systems often use a handle or crank, while automatic systems may involve electric motors. Proper maintenance of window mechanisms is essential for ensuring smooth operation and longevity, preventing issues like sticking or jamming.