R.A. Kartini was an Indonesian national heroine born on April 21, 1879, in Jepara, Central Java. She is best known for her advocacy for women's rights and education in Indonesia during the Dutch colonial period. Kartini's letters, published posthumously, highlighted the struggles of women and called for their empowerment through education. Kartini's legacy continues to inspire many in Indonesia and beyond. Her birthday is celebrated as Kartini Day on April 21 each year, honoring her contributions to women's rights. She is often regarded as a symbol of the fight for gender equality and education in Southeast Asia.