A balloon is a latex, nylon, rubber bag that can expand if filled with gas such as nitrogen, oxygen or helium or air to be inflated. A balloon is mostly used for decorative purposes in parties and are very common with children as a play toy during parties. Balloons are available in various colours to cater to different party themes or to have a variety of colour at parties. Balloons can be filled by blowing into it through the mouth if the intend is to just fill with air or a pump if it is to be inflated with a gas. Helium balloons are now very popular as they defy gravity and stay upright at all times as opposed to balloons that are just filled with air.