The United Nations General assembly has designated November 25 as the International Day for the Elimination of Violence Against Women (Resolution 54/134). The premise of the day is to raise awareness of the fact that women around the world are subject to rape, domestic violence and other forms of violence; furthermore, one of the aims of the day is to highlight that the scale and true nature of the issue is often hidden. For 2014, the official Theme framed by the UN Secretary-General’s campaign UNiTE to End Violence against Women, is Orange your neighbourhood. For 2018, the official theme is “Orange the World:#HearMeToo” and for 2019 it is “Orange the World: Generation Equality Stands Against Rape”
Historically, the date is based on the date of the 1960 assassination of the three Mirabal sisters, political activists in the Dominican Republic; the killings were ordered by Dominican dictator Rafael Trujillo (1930–1961). In 1981, activists at the Latin American and Caribbean Feminist Encuentros marked November 25 as a day to combat and raise awareness of violence against women more broadly; on December 17, 1999, the date received its official United Nations (UN) resolution.The UN and the Inter-Parliamentary Union have encouraged governments, international organizations and NGOs to organize activities to support the day as an international observance.
Source : wikipedia