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.

世界各国都有自己的国庆节，各国对于国庆节的庆贺方式，由于传统和俗的差异，而有所不同。

国庆节是每个国家的重要节日，但各国国庆节的名称有所不同。世界上许多国家叫"国庆节"或"国庆日"，还有一些国家叫"独立日"或"独立节"，也有的叫"共和日"、"共和国日"、"革命日"、"解放日"、"国家复兴节"、"宪法日"等，还有直接以国名加上"日"的，如"澳大利亚日"、"巴基斯坦日"，有的则以国王的生日或登基日为国庆，如遇国王更替，国庆的具体日期也随之更换。

每年国庆，各国都要举行不同形式的庆祝活动，以加强本国人民的爱国意识，增强国家的凝聚力。各国之间也都要相互表示祝贺。逢五逢十的国庆，有的还要扩大庆祝。为庆祝国庆，各国政府通常要举行一次国庆招待会，由国家元首、政府首脑或外交部长出面主持，邀请驻在当地的各国使节和其他重要外宾参加。但也有的国家不举行招待会，如美国、英国均不举行招待会。