One card simply stated: “Thank You for Being My Person.” Advertisement According to the Greeting Card Assn., Americans purchase around 6.5 billion cards each year.

There are times when "thanks" delivered via email is just fine, for instance, when a co-worker does you a favor around the office. But an email to thank your grandmother for a hand-knit sweater ...

There are times when "thanks" delivered via email is just fine, for instance when a co-worker does you a favor around the office. But an email to thank your grandmother for a hand-knit sweater ...

Etiquette expert Jan Goss agrees—so much so that she always carries a baggie of small thank-you cards in her purse. “Never pass up an opportunity to leave a thank-you note.