The cards were just pieces of paper with poems or letters on them. As the years passed, Valentine's Day cards became fancier. Some people decorated their cards with lace, birds, hearts and silk. People liked making and getting these cards so much that companies started making cards. Besides cards, people give other gifts on Valentine's Day.
People give candy and flowers.
These gifts let others know we care about them, too. The heart symbol appears a lot on Valentine's Day cards and gifts. Long ago, people thought that a person's heart was the source of feelings like love. We know today that this isn't true, but the heart symbol still represents love to us. Red is the traditional Valentine's Day color.