All countries in the world have their own National Day, National Day in different countries of the festive way, as the traditional and customs of the differences, and different.

The National Day is an important feast for every country, but the various countries' National Day name is different. Many countries in the world is called "National Day" or "National Day", and some countries called "independence day" or "independence day", also some call "republican", "republic day day", "revolution day", "liberation", "national rejuvenation day" and "constitution day", still have to add the name directly "day", such as "Australia day", "Pakistan day", others in the king's birthday or coronation day as the National Day, such as the case of the king, the date of the National Day changes will be replaced.

National Day each year, countries have a different forms of celebration activities to strengthen its people's patriotic consciousness, strengthen the country's cohesive force. Between the various countries to also congratulate each other. The National Day every ten every five, some will expand to celebrate. To celebrate the National Day, governments usually we will hold a National Day conference, by national heads of state or government or foreign minister, invited presiding in all countries in the local ambassadors and other important foreign guests to attend. But some countries do not held a reception, such as the United States, Britain are not held a reception.