The national flag is an iconic flag and a symbol of the country. It reflects a country's political characteristics and historical and cultural traditions through certain styles, colors and patterns. Generally speaking, in the territory of a sovereign country, it is not allowed to fly the flag of another country at will. The colors of national flags in the world are mainly red, white, green, blue, yellow and black. These colors have their own meanings, and most of them are rectangular.

The national flag is an inevitable product of a country's growing awareness of sovereignty. The original national flag was produced in modern Europe. In medieval Europe, the ruling classes regarded heraldry as a symbol of the family, and later the ribbon color and badge pattern of heraldry developed into the national flag.

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National flag pattern:

The patterns on the national flags of all countries have certain meanings. There are 13 red and white stripes on the American Stars and Stripes, which originally meant to represent 13 states in the United States. Later, it was fixed, and the stars on the national flag represented the States. There are 50 stars on the national flag, representing 50 states in the United States. Eagles and lions are symbols of courage and strength. The flags of Egypt, Zambia, Albania, Bolivia and Ecuador all adopt the eagle pattern. Countries such as Sri Lanka adopt the lion model. Bhutan is a feudal kingdom, and the national flag is a dragon, which not only symbolizes the strength of the country, but also refers to the name of this country, because Bhutan can be translated as "the country of dragons".