First held over a century ago, International Women’s Day highlights the achievements, challenges and struggles of women around the world.

International Women's Day originated from the early 20th-century labor and socialist movements, but why is it celebrated on March 8? In 1910, German socialist Clara Zetkin proposed the idea of an international day to recognize women's struggles and achievements at the International Socialist Women's Conference.

From marches, markets and memoirs, here's what to know about International Women's Day, including how it started and how you can celebrate.