National Day is celebrated in countries around the world to celebration the nationhood of the country. It is most often a federal holiday that brings out the pride in the nation.
National Day goes by other names in various countries. Many countries celebrate Independence Day, Foundation Day, Unity Day, Constitution Day or can be named after the country (such as Canada Day and Australia Day) or a specific historical event such as Bastille Day. Whatever the title of it may be, National Day is the day that brings out the nations spirit and celebrates the country.
The day a nation celebrates typically originates from the date the country became independent, the day it was founded, or another significant date that commemorates the nationhood of the country.