Memorial Day is a day of remembrance and tribute to those who have died serving in the United States Armed Forces. It is a federal holiday celebrated on the last Monday in May. While "Memorial Day" is the most commonly used phrase to describe this holiday, there are other phrases that can be used to express the same meaning. Some alternative terms for Memorial Day include Decoration Day, Remembrance Day, and Poppy Day. Each of these phrases takes on a slightly different meaning and is used in different countries or regions, but ultimately all refer to a day of honoring and remembering those who have made the ultimate sacrifice in service to their country.