A Thank You Card is a small card used to express gratitude to someone for a gift, favor, or kind gesture. These cards often feature a simple design and a blank space for a personal message. They can be sent for various occasions, such as birthdays, weddings, or after receiving help. Typically, a Thank You Card includes a greeting, a message of appreciation, and a closing. People often choose to write their own messages to make the card more personal. Sending a Thank You Card is a thoughtful way to acknowledge someone's kindness and strengthen relationships.