Memorial Day is a federal holiday in the United States, observed on the last Monday of May each year, to honor and remember the men and women who have died while serving in the U.S. military. The holiday was originally called Decoration Day and began after the Civil War to honor fallen Union soldiers. Over time, it evolved to commemorate all American service members who have died in military service. The day serves as a reminder of the sacrifices made by these individuals to protect our freedoms and a time for reflection, gratitude, and remembrance.