International Women’s Day, originally called International Working Women’s Day, is celebrated on March 8 every year. In different regions the focus of the celebrations ranges from general celebration of respect, appreciation, and love towards women for their economic, political, and social achievements.The earliest Women’s Day observance was held on February 28, 1909, in New York; it was organized by the Socialist Party of America in remembrance of the 1908 strike of the International Ladies’ Garment Workers’ Union. There was no specific strike happening on March 8, despite later claims

The day is an official holiday in Afghanistan, Angola, Cuba, Georgia etc.

Source: Wikipedia