Flags of countries often feature common characteristics, such as:

- Colors: Most flags use primary colors such as red, blue, green, and yellow, as well as secondary colors such as orange and purple.
- Stripes: Stripes are a common feature, with some flags featuring a single stripe, and others having multiple stripes in various colors and widths.
- Symbols: Many flags feature symbols, such as stars, crescents, crosses, and birds. These symbols often have cultural or historical significance.
- Geometric shapes: Triangles, circles, and rectangles are commonly used in flag design.
- Emblems: Flags may also include emblems, such as coats of arms, which often represent a country's history or values.
- Proportions: The size and shape of a flag can vary, but most are rectangular, and many have specific proportions, such as the ratio of width to length.
- Meaning: Flags often have symbolic meaning, representing a country's history, culture, or values.
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