'Valentines Day or Saint Valentine's Day' is a holiday celebrated on February 14. In the Americas and Europe, it is the traditional day on which lovers express their love for each other by sending Valentines cards, presenting flowers, or offering confectionery. The holiday is named after two among the numerous Early Christian martyrs named Valentine. The day became associated with romantic love in the circle of Geoffrey Chaucer in the High Middle Ages, when the tradition of courtly love flourished.

The day is most closely associated with the mutual exchange of love notes in the form of "valentines." Modern Valentine symbols include the heart-shaped outline, doves, and the figure of the winged Cupid. Since the 19th century, handwritten notes have largely given way to mass-produced greeting cards.Leigh Eric Schmidt, "The Fashioning of a Modern Holiday: St. Valentine's Day, 1840-1870" Winterthur Portfolio 28.4 (Winter 1993), pp. 209-245. The sending of Valentines was a fashion in nineteenth-century Great Britain, and, in 1847, Esther Howland developed a successful business in her Worcester, Massachusetts home with hand-made Valentine cards based on British models. The popularity of Valentine cards in 19th-century America was a harbinger of the future commercialization of holidays in the United States.Leigh Eric Schmidt, "The Commercialization of the calendar: American holidays and the culture of consumption, 1870-1930" Journal of American History 78.3 (December 1991) pp 890-98.

The U.S. Greeting Card Association estimates that approximately one billion valentines cards are sent each year worldwide, making the day the second largest card-sending holiday of the year behind Christmas. The association estimates that women purchase approximately 85 percent of all valentines.American Greeting Card Association website.