Memorial Day (previously, but now seldom, called Decoration Day) is a federal holiday in the United States for honouring and mourning the military personnel who have died while serving in the United States Armed Forces.
The holiday is now observed on the last Monday of May, having been observed on 30 May from 1868 to 1970.
Many people visit cemeteries and memorials on Memorial Day to honour and mourn those who died while serving in the US Military.
Many volunteers place an American flag on graves of military personnel in national cemeteries.
Memorial Day is also considered the unofficial start of summer in the United States, while Labour Day, the first Monday of September, marks the unofficial start of autumn.
Two other days celebrate those who have served or are serving in the US military: Armed Forces Day (which is earlier in May), an unofficial US holiday for honouring those currently serving in the armed forces, and Veterans Day (in 11 November), which honours those who have served in the United States Armed Forces.