Answer:
The black colour represents its troubled 19th-century history as a protected state, the red colour represents the blood of those who fought for independence (specifically, the Anglo-Afghan Treaty of 1919), and the green represents hope and prosperity for the future. Some have alternatively interpreted the black to represent history, the red to represent progress, and the green to represent either agricultural prosperity or Islam.
The tricolour was supposedly inspired by the Afghan King Amanullah Khan when visiting Europe with his wife in 1928. The original horizontal tricolour design was based on that of the flag of Germany.
Almost every Afghan tricolour flag since 1928 has had the Emblem of Afghanistan in the centre. Almost every emblem has had a mosque in it, which first appeared in 1901, and wheat, first appearing in 1928.
The last tricolour flag took its current form in 2002 with modifications later on in 2004 and 2013, with some variants containing differing coloured emblems.
Following the restoration of the Islamic Emirate of Afghanistan after the Fall of Kabul in 2021, protests took place in Jalalabad and other cities, where protesters were seen waving Afghan tricolour flags protesting its removal in defiance of Taliban rule, due to the reinstatement of the white Shahada flag and the abolishment of the former black, red, and green tricolour flag.
The tricolour flag was used by the Afghan delegation at the 2020 Summer Paralympics between 25 August and 5 September 2021, as well as at the 2021 Cricket T20 World Cup between 26 October and 4 November 2021, both after the fall of Kabul.
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