National anthem:

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National anthem is a nationally recognized song. The song is sung on various national occasions and nationally important occasions. The national anthem reflects the hopes, aspirations and pride of a nation. Every nation has own style of singing of national anthem.

According to Cambridge dictionary “anthem: a song that has special importance for a particular group of people, an organization, or a country, often sung on a special occasion”.
According to Britannica, national anthem, hymn or song expressing patriotic sentiment and either governmentally authorized as an official national hymn or holding that position in popular feeling. The oldest national anthem is Great Britain’s “God save the Queen,” which was described as a national anthem in 1825, although it had been popular as patriotic song and used on occasions of royal ceremonial since the mid-18th century.
According to Collins dictionary, a national anthem is a nation’s official song which is played or sung on public occasions.

National Anthem of Bangladesh:

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"My Golden Bengal"

My Golden Bengal, I love you

Forever your skies, your air set my heart in tune as if it were a flute.

In spring, O mother mine, the fragrance from your mango groves makes me wild with joy!

Ah, what a thrill!

In autumn, O mother mine,

In the full-blossomed paddy fields, I have seen spread all over-sweet smiles!

Ah, what a beauty, what shades, what an affection and what a tenderness!

What a quilt have you spread at the feet of banyan trees and along the banks of rivers!

Oh mother mine, words from your lips are like nectar to my ears!

Ah, what a thrill!

If sadness, Oh mother mine, casts a gloom on your face,

My eyes are filled with tears!

The lyrics were written by Bengali polymath Rabindranath Tagore in 1905, while the melody of the hymn adopted from the Baul singer Gagan Harkara’s song “Ami kothay Pabo Tare” set to Dadra Tala.

Bangladesh became independence in 1971. The song was first sung as the national anthem at an oath-taking ceremony of the provisional government of the People’s Republic of Bangladesh on April 17, 1971 in Mujibnagar.

National anthems possibly provide the strongest, clearest statement of national identity. In essence they serve as modern totems that bear a special relationship to the nations they represent, distinguishing them from one another and reaffirming their identity boundaries.