A curtain wall is a non-structural exterior wall system used in buildings. It is typically made of lightweight materials like glass, metal, or stone, and is designed to protect the interior from weather while allowing natural light to enter. Unlike traditional walls, curtain walls do not support the building's weight; instead, they are hung from the building's structural frame. These walls are popular in modern architecture for their aesthetic appeal and energy efficiency. They can be customized in various designs and finishes, contributing to a building's overall look. architects often use curtain walls to create sleek, contemporary facades in commercial and residential structures.