Saint Valentine's Day, also known as Valentine's Day or the Feast of Saint Valentine, is observed on February 14 each year.
It is celebrated in many countries around the world, although it remains a working day in most of them. There are many stories associated with valentine’s celebration that you can read at Wikipedia
But for most of us Valentine’s Day is the day to show love and affection to your loved ones. This day people sends Valentine’s Day ecards to teachers, children, mothers, wives, sweethearts. Those who are lucky enough to be together go out for party and make this day more memorable.