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.

世界各國都有自己的國慶節，各國對于國慶節的慶賀方式，由于傳統和俗的差異，而有所不同。

國慶節是每個國家的重要節日，但各國國慶節的名稱有所不同。世界上許多國家叫"國慶節"或"國慶日"，還有一些國家叫"獨立日"或"獨立節"，也有的叫"共和日"、"共和國日"、"革命日"、"解放日"、"國家復興節"、"憲法日"等，還有直接以國名加上"日"的，如"澳大利亞日"、"巴基斯坦日"，有的則以國王的生日或登基日為國慶，如遇國王更替，國慶的具體日期也隨之更換。

每年國慶，各國都要舉行不同形式的慶祝活動，以加強本國人民的愛國意識，增強國家的凝聚力。各國之間也都要相互表示祝賀。逢五逢十的國慶，有的還要擴大慶祝。為慶祝國慶，各國政府通常要舉行一次國慶招待會，由國家元首、政府首腦或外交部長出面主持，邀請駐在當地的各國使節和其他重要外賓參加。但也有的國家不舉行招待會，如美國、英國均不舉行招待會。