Valentine's Day, also called Saint Valentine's Day or the Feast of Saint Valentine, is celebrated annually on February 14. It originated as a Christian feast day honoring one or two early Christian martyrs named Saint Valentine and, through later folk traditions, has become a significant cultural, religious, and commercial celebration of romance and love in many regions of the world.

In the United States, about 190 million Valentine's Day cards are sent each year, not including the hundreds of millions of cards school children exchange.

Valentine's Day is a major source of economic activity, with total expenditures in 2017 topping $18.2 billion in 2017, or over $136 per person. This is an increase from $108 per person in 2010.[85] In 2019, a survey by the National Retail Federation found that over the previous decade, the percentage of people who celebrate Valentine's Day had declined steadily. From their survey results, they found three primary reasons: over-commercialization of the holiday, not having a significant other, and not being interested in celebrating it.