Building facades are the exterior walls of a structure, serving both functional and aesthetic purposes. They protect the interior from weather elements while also providing insulation. Facades can be made from various materials, such as glass, brick, or concrete, and their design can greatly influence the overall appearance of a building. In addition to their protective role, facades are crucial for a building's energy efficiency. Modern designs often incorporate solar panels or green walls to enhance sustainability. A well-designed facade can also reflect the character of a city, making it an important aspect of urban architecture and design.