The first World Hindi Day was first celebrated in 2006 by former Prime Minister Dr Manmohan Singh.
It is to mark the anniversary of world's first Hindi conference.
That was organised by former Prime Minister Indira Gandhi on this day in 1975.
Hindi is derived from Sanskrit and written in Devnagari script.
Hindi is among the fourth most spoken languages of the world.
Hindi Diwas is celebrated on 14th September every year to honour the Hindi writers, thinkers and philosophers.
It is observed to mark adaptation of Hindi written in Devanagari script as the Official Language of the Union by the Constituent Assembly on September 14, 1949.