A national anthem is a piece of music that is played in front of the people and has been a staple of our national song since the late 1800s.
It is a popular song that has been sung since the 17th century and has become a fixture of our celebrations throughout the year.
Here’s what the nation will be singing in 2017.
The song is sung in English, French, German, Spanish and Portuguese.
You can listen to it in full on BBC Radio 4 on Tuesday, 22 April at 2100 GMT.