National Day is a legal holiday formulated by a country to commemorate the country itself. It is an important festival in each country, but its name is different. Many countries call it "National Day" or "National Day", while others call it "Independence Day" or "Independence Day", while others call it "Peace Day", "National Day", "National Renaissance Day" and "Constitution Day".
There are also those who directly add "day" to the country name, such as "Australia Day", while others take the birthday of the king or the day of his accession to the throne as the national day. In case of the change of the king, the specific date of the national day will also be changed. They are usually the independence of this country, the signing of the constitution, the birthday of the head of state or other anniversaries of great significance; Some of them are saints' day, the patron saint of this country.