Saint Valentine is the patron saint of lovers. St Valentine's day is celebrated all over the world.
In the UK, people ( children, teenagers and adults) send cards, which can be anonymous, to the people they love or like on February 14th. One billion Valentine's Day cards are sent every year.
People can send flowers, chocolates and other presents to their loved ones.
In the USA, Valentine's day is big business : Americans spend about $10 billion every year!
Hearts, roses and Cupids are the most popular symbols of Valentine's Day. Cupid was the son of Venus, the Roman Goddess of love and beauty. Red is the colour of Valentine's Day because it is the colour of a heart and symbolizes love and passion.