From our friends at Wikipedia:
Memorial Day is a United States federal holiday which occurs every year on the final Monday of May. Memorial Day is a day of remembering the men and women who died while serving in the United States Armed Forces.Formerly known as Decoration Day, it 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 in all wars. It typically marks the start of the summer vacation season, while Labor Day marks its end.
Many people visit cemeteries and memorials, particularly to honor those who have died in military service. Many volunteers place an American flag on each grave in national cemeteries.
By the early 20th century, Memorial Day was an occasion for more general expressions of memory, as people visited the graves of their deceased relatives in church cemeteries, whether they had served in the military or not. It also became a long weekend increasingly devoted to shopping, family gatherings, fireworks, trips to the beach, and national media events.
Annual Decoration Days for particular cemeteries are held on a Sunday in late spring or early summer in some rural areas of the American South, notably in the mountains. In cases involving a family graveyard where remote ancestors as well as those who were deceased more recently are buried, this may take on the character of an extended family reunion to which some people travel hundreds of miles. People gather on the designated day and put flowers on graves and renew contacts with kinfolk and others. There often is a religious service and a “dinner on the ground,” the traditional term for a potluck meal in which people used to spread the dishes out on sheets or tablecloths on the grass. It is believed that this practice began before the American Civil War and thus may reflect the real origin of the “memorial day” idea.
Memorial Day is not to be confused with Veterans Day; Memorial Day is a day of remembering the men and women who died while serving, while Veterans Day celebrates the service of all U.S. military veterans, living or dead.
So this day, as you celebrate with family and friends the first long weekend that kicks off summer, pause, if only briefly, to remember those who have been killed in the many conflicts and wars we seem to take for granted. And also remember that freedom is never free.