A casement is a type of window that is hinged on one side and opens outward, typically using a crank mechanism. This design allows for better ventilation and unobstructed views compared to traditional sliding windows. Casement windows are often made of wood, vinyl, or aluminum and can be found in various styles to match different architectural designs. Casement windows are popular in both residential and commercial buildings due to their energy efficiency and ease of use. They can be fitted with screens to keep insects out while allowing fresh air in. Additionally, casement windows can enhance the aesthetic appeal of a structure, contributing to its overall charm.