Valentine's Day, also called Saint Valentine's Day or the Feast of Saint Valentine,[1] is celebrated annually on February 14. Originating as a Western Christian feast day honoring one or two early saints named Valentinus, Valentine's Day is recognized as a significant cultural, religious, and commercial celebration of romance and romantic love in many regions around the world, although it is not a public holiday in any country.
Valentine's Day customs developed in early modern England and spread throughout the English-speaking world in the 19th century. In the later 20th and early 21st centuries, these customs spread to other countries, but their effect has been more limited than those of Hallowe'en, or than aspects of Christmas,
Due to a concentrated marketing effort, Valentine's Day is celebrated in some East Asian countries with Chinese and South Koreans spending the most money on Valentine's gifts.
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
In India, in antiquity, there was a tradition of adoring Kamadeva, the lord of love; exemplificated by the erotic carvings in the Khajuraho Group of Monuments and by the writing of the Kamasutra.[97] This tradition was lost around the Middle Ages, when Kamadeva was no longer celebrated, and public displays of sexual affection became frowned upon.[97]This repression of public affections began to loosen in the 1990s
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Source : Wikipedia