Sky lanterns are small, lightweight balloons made of paper that are filled with hot air. When the lantern is lit, the heat causes the air inside to rise, allowing the lantern to float into the sky. They are often used during celebrations, festivals, and special events, creating a beautiful sight as they drift upward. Originating from China, sky lanterns have a long history and are sometimes called Kongming lanterns. They are typically released in groups, symbolizing hope and good fortune. However, safety concerns have arisen due to the potential fire hazards they pose, leading to regulations in some areas.