Memorial Day is a federal holiday in the United States for honoring and mourning the military personnel who have died in the performance of their military duties. The holiday is observed on the last Monday of May.
Memorial Day was originally known as Decoration Day and originated after the American Civil War to commemorate the Union and Confederate soldiers who died in the Civil War. By the 20th century, Memorial Day had been extended to honor all Americans who have died while in the military service.
Memorial Day is observed with various traditions, including visiting cemeteries and memorials, volunteering, and attending parades. It is also a popular time for barbecues and picnics as it marks the unofficial beginning of the summer season.