A greeting card is a folded piece of paper, often decorated with images and text, used to convey messages for various occasions. These cards can celebrate events like birthdays, holidays, or anniversaries, and they often include personal notes from the sender. Greeting cards come in various styles, sizes, and themes, making them suitable for different recipients and situations. They can be purchased from stores or made by hand, allowing for a personal touch. Popular occasions for sending greeting cards include Christmas, Valentine's Day, and Mother's Day.