Skyscrapers are tall, continuously habitable buildings that significantly shape the skyline of cities. They are typically designed for commercial, residential, or mixed-use purposes and can reach impressive heights, often exceeding 150 meters. The construction of skyscrapers began in the late 19th century, with iconic examples like the Sears Tower and the Burj Khalifa showcasing advancements in engineering and design. These towering structures not only provide space for offices and homes but also symbolize economic growth and urbanization. Skyscrapers often incorporate innovative technologies for sustainability and energy efficiency, making them a focal point in discussions about modern architecture and city planning.