Helium-filled balloons are lightweight balloons that are filled with the gas helium. Helium is lighter than air, which allows these balloons to float. They are often used for celebrations, such as birthdays and parties, because of their colorful designs and ability to rise high into the sky. When released outdoors, helium-filled balloons can ascend to great heights before eventually popping or deflating. It is important to dispose of them properly, as they can pose a hazard to wildlife and the environment. Many people enjoy using these balloons for decorations and gifts due to their cheerful appearance.