A flag is a piece of fabric, often rectangular, that displays colors, symbols, or designs. Flags are used to represent countries, organizations, or causes. For example, the United States flag has red, white, and blue stripes and stars, symbolizing the nation's values and history. Flags can be seen at events, on buildings, or during celebrations, serving as a source of pride and unity. In addition to national flags, there are also state flags and international flags that represent specific regions or groups. Flags can convey messages, such as peace or warning, and are often used in sports, like the Olympics, to showcase the participating nations.