A national anthem is a patriotic song that represents a country and its values. It is often played during important events, such as national holidays, sports competitions, and official ceremonies. The lyrics usually express love for the country, pride in its history, and a sense of unity among its people. Most national anthems have a unique melody and are written in the official language of the country. Some famous examples include the Star-Spangled Banner of the United States and O Canada. These songs help foster a sense of belonging and identity among citizens, reminding them of their shared heritage.