A glass window is a transparent opening in a wall that allows light to enter a building while providing a view of the outside. It is typically made of glass, which can be clear, frosted, or tinted, depending on the desired level of privacy and light transmission. Windows can be framed with materials like wood, vinyl, or aluminum to enhance durability and aesthetics. Glass windows come in various styles, including casement, double-hung, and sliding designs. They can be single or double-pane, with double-pane windows offering better insulation and energy efficiency. Proper installation and maintenance of glass windows are essential for safety and performance.