What do u understand the word "VALENTINE"? Is there any History behind, since it is celebrated as DAY?

Question

To update my knowledge only

Answer 1

The actual day, Valentine's day, has a history behind it. Here is probably the best overview you will get on Valentine's Day online:
http://www.history.com/minisites/valentine/?page=history

Answer 2

It refers to a man named "Valentine".
There are many versions of "history" of the origin of Valentine's Day.
Take you pick among these:
http://www.history.com/minisites/valentine/
http://www.pictureframes.co.uk/pages/saint_valentine.htm
http://www.newadvent.org/cathen/15254a.htm