Greeting cards are an illustrated message that expresses, either seriously or humorously, affection, good will, gratitude, sympathy, or other sentiments. Greeting cards are usually sent by mail in observance of a special day or event and can be divided into two general classifications: seasonal and everyday. Seasonal cards, also called Holiday Cards, include those for Christmas, Valentine's Day, Mother's Day, Father's Day, Easter, graduation, Halloween, and St. Patrick's Day. Everyday cards include those commemorating birthdays, anniversaries, or births; cards of condolence, congratulations, or friendship; as well as get-well cards, gift cards, bon voyage cards, and thank you cards.
Modern greeting cards are usually of s